The sugar glider (Petaurus breviceps) is a small, omnivorous, arboreal, and nocturnal gliding possum belonging to the marsupial infraclass. The common name refers to its preference for sugary foods like sap and nectar and its ability to glide through the air, much like a flying squirrel. They have very similar habits and appearance to the flying squirrel, despite not being closely related—an example of convergent evolution. The scientific name, Petaurus breviceps, translates from Latin as "short-headed rope-dancer", a reference to their canopy acrobatics.
Temporal range: Pleistocene–Recent
|Illustration by Neville Cayley|
|Sugar glider range|
The sugar glider is characterised by its gliding membrane, known as the patagium, which extends from its forelegs to its hindlegs, one on each side of its body. Gliding serves as an efficient means of reaching food and evading predators. The animal is covered in soft, pale grey to light brown fur which is countershaded, being lighter in colour on its underside.
The sugar glider is endemic to parts of mainland Australia, New Guinea and certain Indonesian islands; and it was introduced to Tasmania, probably in the 1830s. It is a popular exotic pet but is prohibited in some regions, including parts of Australia and the United States.
The genus Petaurus is believed to have originated during the early-mid Miocene period (18 to 24 million years ago), then dispersed from New Guinea to Australia where Australian Petaurus species diverged. The earliest Petaurus species occurred in Australia 4.46 million years ago; and the sugar glider is the only Petaurus species endemic to both Australia and New Guinea.
The species is divided into seven subspecies; three occur in Australia, four in New Guinea, although debate regarding current species delineation continues. These seven subspecies are currently designated by small morphological differences such as colour and body size. However, genetic analysis using mitochondrial DNA indicates that the morphological subspecies may not represent genetically unique populations.
Contrary to the current geographic distribution of sugar gliders, two genetically distinct populations in Australia may have arisen due to long term geographical isolation following drying of the Australian continent after the Pliocene and the uplift of the Great Dividing Range, by a process known as allopatric speciation. One population is found in coastal New South Wales and southern Queensland; and the other is found in northern Queensland, inland and southern New South Wales, Victoria and South Australia.
Further evidence is required to clarify if changes to the current taxonomic divisions are warranted; for example, subspecies P. b. biacensis is provisionally considered a separate species, Biak glider (Petaurus biacensis).[note 3]
Distribution and habitatEdit
Sugar gliders are found throughout the northern and eastern parts of mainland Australia, Tasmania, New Guinea and several associated isles, the Bismarck Archipelago, Louisiade Archipelago, and certain isles of Indonesia, Halmahera Islands of the North Moluccas. The earliest Australian sugar glider fossils were found in a cave in Victoria and are dated to 15,000 years ago, at the time of the Pleistocene epoch. The facilitated introduction of the sugar glider to Tasmania in 1835 is supported by the absence of skeletal remains in subfossil bone deposits and the lack of an Aboriginal Tasmanian name for the animal. In Australia, sugar glider distribution corresponds with forests along the southern, eastern and northern coastlines, and extends to altitudes of 2000 m in the eastern ranges.
The sugar glider occurs in sympatry with the squirrel glider, mahogany glider, and yellow-bellied glider; and their coexistence is permitted through niche partitioning where each species has different patterns of resource use.
They have a broad habitat niche, inhabiting rainforests and coconut plantations in New Guinea; and rainforests, wet or dry sclerophyll forest and acacia scrub in Australia; preferring habitats with Eucalypt and Acacia species. The main structural habitat requirements are a large number of stems within the canopy, and dense mid and upper canopy cover, likely to enable efficient movement through the canopy.
Like all arboreal, nocturnal marsupials, sugar gliders are active at night, and they shelter in tree hollows lined with leafy twigs during the day.
The average home range of sugar gliders is 0.5 hectares (1.2 acres), and is largely related to the abundance of food sources; density ranges from two to six individuals per hectare (0.8–2.4 per acre).
Native owls (Ninox sp.) are their primary predators; others in their range include kookaburras, goannas, snakes, and quolls. Feral cats (Felis catus) also represent a significant threat.
Appearance and anatomyEdit
The sugar glider has a squirrel-like body with a long, partially (weakly) prehensile tail. The length from the nose to the tip of the tail is about 24–30 cm (9–12 in), and males and females weigh 140 and 115 grams (5 and 4 oz) respectively. Heart rate range is 200–300 beats per minute, and respiratory rate is 16–40 breaths per minute. The sugar glider is a sexually dimorphic species, with males typically larger than females. Sexual dimorphism has likely evolved due to increased mate competition arising through social group structure; and is more pronounced in regions of higher latitude, where mate competition is greater due to increased food availability.
The fur coat on the sugar glider is thick, soft, and is usually blue-grey; although some have been known to be yellow, tan or (rarely) albino.[a] A black stripe is seen from its nose to midway on its back. Its belly, throat, and chest are cream in colour. Males have four scent glands, located on the forehead, chest, and two paracloacal (associated with, but not part of the cloaca, which is the common opening for the intestinal, urinal and genital tracts) that are used for marking of group members and territory. Scent glands on the head and chest of males appear as bald spots. Females also have a paracloacal scent gland and a scent gland in the pouch, but do not have scent glands on the chest or forehead.
The sugar glider is nocturnal; its large eyes help it to see at night and its ears swivel to help locate prey in the dark. The eyes are set far apart, allowing more precise triangulation from launching to landing locations while gliding.
Each foot on the sugar glider has five digits, with an opposable toe on each hind foot. These opposable toes are clawless, and bend such that they can touch all the other digits, like a human thumb, allowing it to firmly grasp branches. The second and third digits of the hind foot are partially syndactylous (fused together), forming a grooming comb. The fourth digit of the forefoot is sharp and elongated, aiding in extraction of insects under the bark of trees.
The gliding membrane extends from the outside of the fifth digit of each forefoot to the first digit of each hind foot. When the legs are stretched out, this membrane allows the sugar glider to glide a considerable distance. The membrane is supported by well developed tibiocarpalis, humerodorsalis and tibioabdominalis muscles, and its movement is controlled by these supporting muscles in conjunction with trunk, limb and tail movement.
Biology and behaviourEdit
The sugar glider is one of a number of volplane (gliding) possums in Australia. Gliders glide with the fore- and hind-limbs extended at right angles to their body, with their feet flexed upwards. The animal launches itself from a tree, spreading its limbs to expose the gliding membranes. This creates an aerofoil enabling them to glide 50 metres (55 yards) or more. For every 1.82 m (6 ft 0 in) travelled horizontally when gliding, sugar gliders fall 1 m (3 ft 3 in). Sugar gliders can steer by moving their limbs and adjusting the tension of their gliding membrane; for example, to turn left, a sugar glider will lower its left forearm below its right.
This form of arboreal locomotion is typically used to travel from tree to tree; the species rarely descends to the ground. Gliding provides three dimensional avoidance of arboreal predators, and minimal contact with ground dwelling predators; as well as possible benefits in decreasing time and energy consumption spent foraging for nutrient poor foods that are irregularly distributed. Young carried in the pouch of females are protected from landing forces by the septum that separates them within the pouch.
Sugar gliders can tolerate ambient air temperatures of up to 40 °C (104 °F) through behavioural strategies such as licking their coat and exposing the wet area, as well as drinking small quantities of water. In cold weather, sugar gliders will huddle together to avoid heat loss, and will enter torpor to conserve energy. Huddling as an energy conserving mechanism is not as efficient as torpor. Before entering torpor, a sugar glider will reduce activity and body temperature normally in order to lower energy expenditure and avoid torpor. With energetic constraints, the sugar glider will enter into daily torpor for 2–23 hours while in rest phase. Torpor differs from hibernation in that torpor is usually a short-term daily cycle. Entering torpor saves energy for the animal by allowing its body temperature to fall to a minimum of 10.4 °C (50.7 °F) to 19.6 °C (67.3 °F). When food is scarce, as in winter, heat production is lowered in order to reduce energy expenditure. With low energy and heat production, it is important for the sugar glider to peak its body mass by fat content in the autumn (May/June) in order to survive the following cold season. In the wild, sugar gliders enter into daily torpor more often than sugar gliders in captivity. The use of torpor is most frequent during winter, likely in response to low ambient temperature, rainfall, and seasonal fluctuation in food sources.
Diet and nutritionEdit
Sugar gliders are seasonally adaptive omnivores with a wide variety of foods in their diet, and mainly forage in the lower layers of the forest canopy. Sugar gliders may obtain up to half their daily water intake through drinking rainwater, with the remainder obtained through water held in its food. In summer they are primarily insectivorous, and in the winter when insects (and other arthropods) are scarce, they are mostly exudativorous (feeding on acacia gum, eucalyptus sap, manna,[b] honeydew or lerp). Sugar gliders have an enlarged caecum to assist in digestion of complex carbohydrates obtained from gum and sap.
To obtain sap or gum from plants, sugar gliders will strip the bark off trees or open bore holes with their teeth to access stored liquid. Little time is spent foraging for insects, as it is an energetically expensive process, and sugar gliders will wait until insects fly into their habitat, or stop to feed on flowers. Gliders consume approximately 11 g of dry food matter per day. This equates to roughly 8% and 9.5% of body weight for males and females, respectively.
They are opportunistic feeders and can be carnivorous, preying mostly on lizards and small birds. They eat many other foods when available, such as nectar, acacia seeds, bird eggs, pollen, fungi and native fruits. Pollen can make up a large portion of their diet, therefore sugar gliders are likely to be important pollinators of Banksia species.
Like most marsupials, female sugar gliders have two ovaries and two uteri; they are polyestrous, meaning they can go into heat several times a year. The female has a marsupium (pouch) in the middle of her abdomen to carry offspring. The pouch opens anteriorly, and two lateral pockets extend posteriorly when young are present. Four nipples are usually present in the pouch, although reports of individuals with two nipples have been recorded. Male sugar gliders have a bifurcated penis to correspond with the two uteri of females.
The age of sexual maturity in sugar gliders varies slightly between the males and females. Males reach maturity at 4 to 12 months of age, while females require from 8 to 12 months. In the wild, sugar gliders breed once or twice a year depending on the climate and habitat conditions, while they can breed multiple times a year in captivity as a result of consistent living conditions and proper diet.
A sugar glider female gives birth to one (19%) or two (81%) babies (joeys) per litter. The gestation period is 15 to 17 days, after which the tiny joey 0.2 g (0.0071 oz) will crawl into a mother's pouch for further development. They are born largely undeveloped and furless, with only the sense of smell being developed. The mother has a scent gland in the external marsupium to attract the sightless joeys from the uterus. Joeys have a continuous arch of cartilage in their shoulder girdle which disappears soon after birth; this supports the forelimbs, assisting the climb into the pouch. Young are completely contained in the pouch for 60 days after birth, wherein mammae provide nourishment during the remainder of development. Eyes first open around 80 days after birth, and young will leave the nest around 110 days after birth. By the time young are weaned, the thermoregulatory system is developed, and in conjunction with a large body size and thicker fur, they are able to regulate their own body temperature.
Breeding is seasonal in southeast Australia, with young only born in winter and spring (June to November). Further north in Arnhem Land, breeding is not seasonally restricted and young may be born throughout the year. Unlike animals that move along the ground, the sugar glider and other gliding species produce fewer, but heavier, offspring per litter. This allows female sugar gliders to retain the ability to glide when pregnant.
Sugar gliders are highly social animals. They live in family groups or colonies consisting of up to seven adults, plus the current season's young. Up to four age classes may exist within each group, although some sugar gliders are solitary, not belonging to a group. They engage in social grooming, which in addition to improving hygiene and health, helps bond the colony and establish group identity.
Within social communities, there are two codominant males who suppress subordinate males, but show no aggression towards each other. These co-dominant pairs are more related to each other than to subordinates within the group; and share food, nests, mates, and responsibility for scent marking of community members and territories.
Territory and members of the group are marked with saliva and a scent produced by separate glands on the forehead and chest of male gliders. Intruders who lack the appropriate scent marking are expelled violently. Rank is established through scent marking; and fighting does not occur within groups, but does occur when communities come into contact with each other. Within the colony, no fighting typically takes place beyond threatening behaviour. Each colony defends a territory of about 1 hectare (2.5 acres) where eucalyptus trees provide a staple food source.
Sugar gliders are one of the few species of mammals that exhibit male parental care. The oldest codominant male in a social community shows a high level of parental care, as he is the probable father of any offspring due to his social status. This paternal care evolved in sugar gliders as young are more likely to survive when parental investment is provided by both parents. In the sugar glider, biparental care allows one adult to huddle with the young and prevent hypothermia while the other parent is out foraging, as young sugar gliders aren’t able to thermoregulate until they are 100 days old (3.5 months).
Communication in sugar gliders is achieved through vocalisations, visual signals and complex chemical odours. Chemical odours account for a large part of communication in sugar gliders, similar to many other nocturnal animals. Odours may be used to mark territory, convey health status of an individual, and mark rank of community members. Gliders produce a number of vocalisations including barking and hissing.
The sugar glider is not considered endangered, and its conservation rank is "Least Concern (LC)" on the IUCN Red List. Despite the loss of natural habitat in Australia over the last 200 years, it is adaptable and capable of living in small patches of remnant bush, particularly if it does not have to cross large expanses of cleared land to reach them. However, several close relatives are endangered, particularly Leadbeater's possum and the mahogany glider. Sugar gliders may persist in areas that have undergone mild-moderate selective logging, as long as three to five hollow bearing trees are retained per hectare. Although not currently threatened by habitat loss, the ability of sugar gliders to forage and avoid predators successfully may be decreased in areas of high light pollution.
Conservation in Australia is enacted at the federal, state and local levels, where sugar gliders are protected as a native species. The central conservation law in Australia is the Environment Protection and Biodiversity Conservation Act 1999 (EPBC Act). The National Parks and Wildlife Act 1974 is an example of conservation law in the state of South Australia, where it is legal to keep (only) one sugar glider without a permit, provided it was acquired legally from a source with a permit. A permit is required to obtain or possess more than one glider, or if one wants to sell or give away any glider in their possession. It is illegal to capture or sell wild sugar gliders without a permit.
Introduction to TasmaniaEdit
According to naturalist Ronald Campbell Gunn, no Petaurus species is indigenous to Tasmania. He concluded that sugar gliders had been brought to Launceston, Tasmania as pets from Port Phillip, Australia (now Melbourne) soon after the founding of the port in 1834. Some sugar gliders had escaped and quickly became established in the area. The species has been identified as a threat to the survival of the swift parrot, which breeds only in Tasmania. Reduction in mature forest cover has left swift parrot nests highly vulnerable to predation by sugar gliders, and it is estimated that the parrot could be extinct by 2031.
In captivity, the sugar glider can suffer from calcium deficiencies if not fed an adequate diet. A lack of calcium in the diet causes the body to leach calcium from the bones, with the hind legs first to show noticeable dysfunction. Calcium to phosphorus ratios should be 2:1 to prevent hypocalcemia, sometimes known as hind leg paralysis (HLP). Their diet should be 50% insects (gut-loaded) or other sources of protein, 25% fruit and 25% vegetables. Some of the more recognised diets are Bourbon's Modified Leadbeaters (BML), High Protein Wombaroo (HPW) and various calcium rich diets with Leadbeaters Mixture (LBM). Iron storage disease (hemochromatosis) is another dietary problem that has been reported in captive gliders and can lead to fatal complications if not diagnosed and treated early.
Plenty of attention and environmental enrichment may be required for this highly social species, especially for those kept as individuals. Inadequate social interaction can lead to depression and behavioural disorders such as loss of appetite, irritability and self-mutilation.
As a petEdit
In several countries, the sugar glider is popular as an exotic pet, and is sometimes referred to as a pocket pet. In Australia, there is opposition to keeping native animals as pets from Australia's largest wildlife rehabilitation organisation (WIRES), and concerns from Australian wildlife conservation organisations regarding animal welfare risks including neglect, cruelty and abandonment.
In Australia, sugar gliders can be kept in Victoria, South Australia, and the Northern Territory. However, they are not allowed to be kept as pets in Western Australia, New South Wales, the Australian Capital Territory, Queensland or Tasmania.
Sugar gliders are popular as pets in the United States, where they are bred in large numbers. Most states and cities allow sugar gliders as pets, with some exceptions including California, Hawaii, Alaska, and New York City. In 2014, Massachusetts changed its law, allowing sugar gliders to be kept as pets. Some other states require permits or licensing. Breeders of sugar gliders are regulated and licensed by the US Department of Agriculture (USDA) Animal and Plant Health Inspection Service (APHIS) through the Animal Welfare Act.
It has been suggested that the expanding overseas trade in sugar gliders was initiated from illegally sourced sugar gliders from Australia, which were bred for resale in Indonesia. DNA analysis, however, indicates that "the USA sugar glider population originates from West Papua, Indonesia with no illegal harvesting from other native areas such as Papua New Guinea or Australia". There have been numerous media and internet articles which evidence a history of cruelty. There are also many internet and media articles reporting on why sugar gliders should not be kept as pets. Sugar glider rescue organisations have been set up in several US States to cope with surrendered and abandoned sugar gliders.
- Tate & Archbold, 1935; subspecies P. b. tafa considered a synonym of species P. breviceps
- P. b. flavidus (Tate and Archbold, 1935) considered a synonym of P. b. papuanus (Thomas 1888)
- Subspecies (former) P. b. biacensis provisionally considered species: P. biacensis (Biak glider). "Helgen (2007) states that Petaurus biacensis is likely to be conspecific with P. breviceps. P. biacensis appears to differ from the latter mainly by having a higher incidence of melanism (Helgen 2007). We provisionally retain P. biacensis as a separate species pending further taxonomic work, thus following what has become standard treatment (e.g., Flannery 1994, 1995; Groves 2005)."
- Groves, C.P. (2005). Wilson, D.E.; Reeder, D.M. (eds.). Mammal Species of the World: A Taxonomic and Geographic Reference (3rd ed.). Baltimore: Johns Hopkins University Press. p. 55. ISBN 0-801-88221-4. OCLC 62265494.
- Salas, L., Dickman, C., Helgen, K., Winter, J., Ellis, M., Denny, M., Woinarski, J., Lunney, D., Oakwood, M., Menkhorst, P. & Strahan, R. (2016). Petaurus breviceps. The IUCN Red List of Threatened Species. doi:10.2305/IUCN.UK.2016-2.RLTS.T16731A21959798.en
- Waterhouse, G. R. (1838). "Observations on certain modifications observed in the dentition of the Flying Opossums (the genus Petaurus of authors)". Proceedings of the Zoological Society of London. 4: 149–153. doi:10.1111/j.1096-3642.1838.tb01419.x.
- Gould, J. (1842). "On some New Species of Australian Mammals". Proceedings of the Zoological Society of London. 10: 11–12. doi:10.1111/j.1469-7998.1842.tb00054.x.
- Longman, H. A. (1924). "Abstr". Proceedings of the Royal Society of Queensland. 36: ix.
- Thomas, Oldfield (1888). "Petraurus breviceps, var. papuanus". Catalogue of the Marsupialia and Monotremata in the Collection of the British Museum (Natural History). London: Taylor and Francis. pp. 158–159.
- Subspecies Sheet | Mammals'Planet Archived 18 August 2016 at the Wayback Machine. Planet-mammiferes.org. Retrieved on 2014-04-19.
- "The IUCN Red List of Threatened Species". IUCN Red List of Threatened Species. Retrieved 25 October 2018.
- Peters, Hr. (1859). "Bericht über ein neues Flugbeutelthier, Petaurus (Belideus), aus dem südlichen Theile von Neuholland". Monatsberichte der Königlichen Preussische Akademie des Wissenschaften zu Berlin: 14–15.
- Troughton, Ellis (1945). "Diagnoses of New Mammals from the South-West Pacific". Records of the Australian Museum. 21 (6): 373–374. doi:10.3853/j.0067-1975.21.1945.551.
- DPIPWE – Sugar Glider
- "Analogy: Squirrels and Sugar Gliders". Understanding Evolution. The University of California Museum of Paleontology. Retrieved 1 October 2012.
- "Sugar Glider, Petaurus breviceps". Parks & Wildlife Service, Tasmania Online. Retrieved 7 October 2012.
- Endo, H; Yokokawa, K; Kurohmaru, M; Hiyashi, Y (1998). "Functional anatomy of gliding membrane muscles in the sugar glider (Petaurus breviceps)". Annals of Anatomy. 180: 93–96. doi:10.1016/S0940-9602(98)80149-0.
- Smith, Meredith J. (13 June 1973). "Petaurus breviceps". Mammalian Species (30): 1–5. doi:10.2307/3503785. JSTOR 3503785.
- Gunn, R.C. (1846). "In Minutes of the Tasmanian Society, July 2, 1845" (PDF). Tasmania Journal. 2 (11): 458–459.
- Gunn, R.C. (1851). "On the introduction and naturalization of Petaurus sciureus in Tasmania". Papers and Proceedings of the Royal Society of Van Dieman's Land. 1: 253–255.
- Malekian, M; Cooper, S; Norman, J; Christidis, L; Carthew, S (2010). "Molecular systematics and evolutionary origins of the genus "Petaurus" (Marsupialia: Petauridae) in Australia and New Guinea". Molecular Phylogenetics and Evolution. 54 (1): 122–135. doi:10.1016/j.ympev.2009.07.026. PMID 19647084.
- Malekian, Mansoureh; Cooper, Steven J. B.; Carthew, Susan M. (2010). "Phylogeography of the Australian sugar glider (Petaurus breviceps): evidence for a new divergent lineage in eastern Australia". Australian Journal of Zoology. 58 (3): 165. doi:10.1071/ZO10016.
- Dickman, Ronald M. Nowak; introduction by Christopher R. (2005). Walker's marsupials of the world. Baltimore: Johns Hopkins University Press. p. 190. ISBN 0801882222.
- "Wildlife – Sugar Glider". Wildlife Queensland. Archived from the original on 23 February 2014. Retrieved 16 February 2014.
- Jackson, Stephen M. (2000). "Habitat relationships of the mahogany glider, Petaurus gracilis, and the sugar glider, Petaurus breviceps". Wildlife Research. 27 (1): 39. doi:10.1071/WR98045.
- Wormington, K; Lamb, D; McCallum, H; Moolooney, d (2002). "Habitat requirements for the conservation of arboreal marsupials in dry sclerophyll forests of southeast Queensland, Australia". Forest Science. 48 (2): 217–227.
- Suckling, G.C (1984). "Population ecology of the sugar glider "Petaurus breviceps", in a system of fragmented habitats". Australian Wildlife Research. 11: 49–75. doi:10.1071/WR9840049.
- Pye, BVSc, MSc, Geoffrey W. "A guide to medicine and surgery in sugar gliders". Hilltop Animal Hospital. Archived from the original on 21 March 2015. Retrieved 2 November 2012.CS1 maint: Multiple names: authors list (link)
- "Wildlife Queensland – Sugar Glider". Wildlife Preservation Society of Queensland. Archived from the original on 23 February 2014. Retrieved 24 October 2012.
- "Basic Health Care Information / General Wellness Exam". Sugar Glider Vet. Retrieved 27 October 2012.
- Quin, DG; Smith, AP; Norton, TW (1996). "Eco-graphic variation in size and sexual dimorphism in sugar gliders and squirrel gliders (Marsupialia: Petauridae)". Australian Journal of Zoology. 44: 19–45. doi:10.1071/ZO9960019.
- Jackson, S. M. (1999). "Glide angle in the genus "Petaurus" and a review of gliding in mammals". Mammal Review. 30: 9–30. doi:10.1046/j.1365-2907.2000.00056.x.
- de Magalhaes, J. P.; Budovsky, A.; Lehmann, G.; Costa, J.; Li, Y.; Fraifeld, V.; Church, G. M. (2009). "The Human Ageing Genomic Resources: online databases and tools for biogerontologists". Aging Cell. 8 (1): 65–72. doi:10.1111/j.1474-9726.2008.00442.x. PMC 2635494. PMID 18986374. "AnAge entry for Petaurus breviceps".
- Strahan, the Australian Museum (1983). Ronald (ed.). Complete book of Australian mammals : the national photographic index of Australian wildlife (1. publ. ed.). [Sidney]: Angus & Robertson. ISBN 0207144540.
- Nagy, K. A.; Suckling, G. C. (1985). "Field energetics and water balance of sugar gliders, "Petaurus breviceps" (Marsupialia: Petauridae)". Australian Journal of Zoology. 33 (5): 683–691. doi:10.1071/ZO9850683.
- Byrnes, G; Spence, A (2011). "Ecological and biomechanical insights into the evolution of gliding in mammals". Integrative and Comparative Biology. 51 (6): 991–1001. doi:10.1093/icb/icr069. PMID 21719434.
- Kortner, G; Geiser, F (2000). "Torpor and activity patterns in free-ranging sugar gliders "Petaurus breviceps" (Marsupialia)". Oecologia. 123 (3): 350–357. Bibcode:2000Oecol.123..350K. doi:10.1007/s004420051021. PMID 28308589.
- Geiser, Fritz (2004). "Metabolic Rate and Body Temperature Reduction During Hibernation and Daily Torpor". Annual Review of Physiology. 66 (1): 239–274. doi:10.1146/annurev.physiol.66.032102.115105. PMID 14977403.
- Christian, Nereda; Fritz Geiser (2007). "To use or not to use torpor? Activity and body temperature as predictors". Naturwissenschaften. 94 (6): 483–487. Bibcode:2007NW.....94..483C. doi:10.1007/s00114-007-0215-5. PMID 17252241.
- Holloway, JC; Geiser, F (November 2001). "Seasonal changes in the thermoenergetics of the marsupial sugar glider, Petaurus breviceps". J. Comp. Physiol. B. 171 (8): 643–50. doi:10.1007/s003600100215. PMID 11765973.
- Smith, AP (1982). "Diet and feeding strategies of the marsupial glider in temperate Australia". Journal of Animal Ecology. 51: 149–166. doi:10.2307/4316. JSTOR 4316.
- "manna". WordNet Search – 3.1. WordNet. Princeton University. Retrieved 19 December 2012.
(n) manna (hardened sugary exudation of various trees) : Synset (semantic) relations, direct hypernym (n) sap (a watery solution of sugars, salts, and minerals that circulates through the vascular system of a plant)
- Pickert, Executive: Joseph P., ed. (1992). The American heritage dictionary of the English language (4th ed.). Boston: Houghton Mifflin. p. 1065. ISBN 0395825172.
manna n. 4. The dried exudate of certain plants
- Janine M., DVM. Cianciolo (ed.). "Sugar Glider Nutrition". Past Newsletters. SunCoast Sugar Gliders.
Sugar gliders eat manna in the wild. Manna is a crusty sugar left from where sap flowed from a wound in a tree trunk or branch.
- "The Sugar Glider Diet". Sugar Glider Diet Archives. Sugar Glider Cage. Archived from the original on 24 August 2012. Retrieved 6 October 2012.
- Dierenfeld, Ellen (2009). "Feeding behavior and nutrition of the Sugar Glider (Petaurus breviceps)". Veterinary Clinics of North America: Exotic Animal Practice. 12 (2): 209–215. doi:10.1016/j.cvex.2009.01.014.
- McLeod, DVM, Lianne. "Feeding Sugar Gliders / Nutritional Needs and Sample Diets". About.com. Retrieved 3 October 2012.
- "Natural Diet". Gliderpedia. SugarGlider.com. Retrieved 2 November 2012.
- van Tets, Ian G.; Whelan, Robert J. (1997). "Banksia pollen in the diet of Australian mammals". Ecography. 20 (5): 499–505. doi:10.1111/j.1600-0587.1997.tb00418.x.
- Morges, Michelle A.; Grant, Krystan R.; MacPhail, Catriona M.; Johnston, Matthew S. (March 2009). "A Novel Technique for Orchiectomy and Scrotal Ablation in the Sugar Glider (Petaurus breviceps)". Journal of Zoo and Wildlife Medicine. 40 (1): 204–206. doi:10.1638/2007-0169.1.
- Tynes, Valarie V., ed. (2010). "Sugar gliders". Behavior of exotic pets (1st ed.). Chichester, West Sussex: Blackwell Pub. ISBN 9780813800783.
- Antinoff, Natalie (August 2009). "Practical anatomy and physical examination: Ferrets, rabbits, rodents, and other selected species (Proceedings)". CVC in Kansas City Proceedings. Archived from the original on 24 July 2013. Retrieved 11 November 2012.CS1 maint: Unfit url (link)
- Holloway, Joanne C.; Geiser, Fritz (November 2000). "Development of thermoregulation in the sugar glider Petaurus breviceps (Marsupialia: Petauridae)". Journal of Zoology. 252 (3): 389–397. doi:10.1111/j.1469-7998.2000.tb00634.x.
- Fokidis, H; Risch, T (2008). "The burden of motherhood: gliding locomotion in mammals influences maternal reproductive investment". Journal of Mammalogy. 89 (3): 617–625. doi:10.1644/07-MAMM-A-116R1.1.
- Klettenheimer, B; Temple-Smith, P; Sofrondis, G (1997). "Father and son sugar gliders: more than a genetic coalition?". Journal of Zoology. 242 (4): 741–750. doi:10.1111/j.1469-7998.1997.tb05823.x.
- Pasatta, J. (1999). "Petaurus breviceps" (On-line), Animal Diversity Web. Accessed November 10, 2012
- Goldingay, R. L. (2010). "Direct male parental care observed in wild sugar gliders". Australian Mammalogy. 32 (2): 177–178. doi:10.1071/AM10009.
- "The IUCN Red List of Threatened Species". IUCN Red List of Threatened Species. Retrieved 25 October 2018.
- Wormington, K.; Lamb, D.; McCallum, H.; Moolooney, d. (2002). "Habitat requirements for the conservation of arboreal marsupials in dry sclerophyll forests of southeast Queensland, Australia". Forest Science. 48 (2): 217–227.
- Barber-Myer, SM (2007). "Photopollution impacts on the nocturnal behaviour of the Sugar Glider (Petaurus breviceps)". Pacific Conservation Biology. 13 (3): 171–176. doi:10.1071/PC070171.
- Biodiversity Conservation. Environment.gov.au. Retrieved on 2014-04-19.
- South Australian Legislation. Legislation.sa.gov.au. Retrieved on 2014-04-19.
- "Tasmania's swift parrot in danger of extinction, calls to list the bird as critically endangered", ABC News, 2015-03-26
- "Hind Leg Paralysis". SugarGlider.com. Retrieved 1 November 2012.
- Lennox, A. M. (2007). "Emergency and Critical Care Procedures in Sugar Gliders (Petaurus breviceps), African Hedgehogs (Atelerix albiventris), and Prairie Dogs (Cynomys spp.)". Veterinary Clinics of North America: Exotic Animal Practice. 10 (2): 533–55. doi:10.1016/j.cvex.2007.01.001. PMID 17577562.
- Conservation and natural resources, 1995 Mammals of Victoria, ed. by Menkhorst. P., Oxford University Press, South Melbourne ISBN 0-19-553733-5
- "Original BML Diet – Bourbon's Modified Leadbeater's Recipe for Sugar Gliders". Sweet-Sugar-Gliders.com. Retrieved 1 October 2012.
- "Sugar Glider HPW Diet – High Protein Wombaroo Recipe". Sweet-Sugar-Gliders.com. Retrieved 1 October 2012.
- "Original Leadbeaters Diet Recipe – Taronga Zoo Diet for Sugar Gliders". Sweet-Sugar-Gliders.com. Retrieved 2 November 2012.
- Hess, Laurie. "Overview of Sugar Gliders - Exotic and Laboratory Animals". Merck Veterinary Manual. Merck Sharp & Dohme. Retrieved 9 May 2018.
- Jepson, Lance (2 November 2015). "7: Sugar gliders". Exotic Animal Medicine: A Quick Reference Guide. Elsevier Health Sciences. p. 234. ISBN 9780323394307.
- "Native Animals are not pets". NSW Wildlife Information Rescue and Education Service Blog January 2019. 25 January 2019. Retrieved 10 March 2019.
- "Sugar Gliders". Wild4Life. Retrieved 10 March 2019.
- "DixiGliders". Archived from the original on 20 January 2011. Retrieved 31 December 2010.
- Wildlife – Queensland Gliders Archived 20 April 2013 at the Wayback Machine. (PDF) . Retrieved on 2014-04-19.
- "Illegal pets in California". Retrieved 18 June 2019.
- "Illegal pets in Hawaii". Retrieved 2 January 2013.
- New York City Health Code. nyc.gov. Retrieved on 2016-06-23.
- MacCallum, Wayne F. , Director. "Notice of Changes In the Law Relative to Wildlife that May be Sold By Licensed Pet Shops or Kept as Pets in Massachusetts" (PDF). Division of Fisheries & Wildlife. Commonwealth of Massachusetts. Retrieved 10 February 2014.
- "Summary of State Laws Relating to Private Possession of Exotic Animals". Born Free USA. Retrieved 24 October 2012.
- "Sugarglider.com – Gliderpedia – Laws". www.sugarglider.com. Retrieved 20 July 2016.
- Committee., Australia. Parliament. Senate. Rural and Regional Affairs and Transport References (1998). Commercial utilisation of Australian native wildlife : report of the Senate Rural and Regional Affairs and Transport References Committee. Woodley, John, 1938-. Canberra: The Committee. pp. Chapter 17. ISBN 0642267812. OCLC 39840227.
- "Aussie wildlife in black markets for pets". www.couriermail.com.au. 17 June 2012. Retrieved 15 March 2019.
- Campbell, Catriona D.; Pecon-Slattery, Jill; Pollak, Rebecca; Joseph, Leo; Holleley, Clare E. (8 January 2019). "The origin of exotic pet sugar gliders ( Petaurus breviceps ) kept in the United States of America". PeerJ. 7: e6180. doi:10.7717/peerj.6180. ISSN 2167-8359. PMC 6329365.
- "Sugar gliders at the mercy of Americans". www.news.com.au. Retrieved 15 March 2019.
- "Here's Why You Should Never Buy Sugar Gliders as Pets". PETA. Retrieved 15 March 2019.
- Mar 10, Julia Wright · CBC News · Posted:; March 10, 2018 9:00 AM AT | Last Updated:; 2018. "Weird, cute big-eyed sugar gliders: the new pet craze | CBC News". CBC. Retrieved 15 March 2019.
- "10 Reasons Why Sugar Gliders Should Not Be Kept as Pets". PetHelpful. Retrieved 15 March 2019.
- Nosowitz, Dan (23 November 2013). "Sugar Gliders Are Not Pets". The Dodo. Retrieved 15 March 2019.
- "Lucky Glider Rescue & Sanctuary | Clifton Animal Rescue". www.luckyglider.org. Retrieved 15 March 2019.
- "Akron Sugar Glider Rescue". Akron Sugar Glider Rescue. Retrieved 15 March 2019.
- Beld, John van den (1992). Nature of Australia : a portrait of the island continent (Revised ed.). Sydney: Collins Australia. ISBN 0-7333-0241-6.
- Cayley, [by] Ellis Troughton; with twenty-five plates in colour by Neville W. (1973). Furred animals of Australia (Rev. and abridged ed.). Sydney: Angus & Robertson. ISBN 0-207-12256-3.
- Fry, [by] W.D.L. Ride. With drawings by Ella (1970). A guide to the native mammals of Australia. Melbourne: Oxford University Press. ISBN 0195502523.
- Morcombe, Michael; Morcombe, Irene (1974). Mammals of Australia. Sydney: Australian Universities Press. ISBN 0-7249-0017-9.
- Russel, Rupert Russel illustr. by Kay (1980). Spotlight on possums. Queensland, St . Lucia: University of Queensland Press. ISBN 0-7022-1478-7.
- Serventy, [by] Vincent (1977). Wildlife of Australia (Rev. ed.). West Melbourne, Vic.: Thomas Nelson (Australia). ISBN 0-17-005168-4.
- Westmacott, Leonard Cronin (1991). Key guide to Australian mammals. Illustrated by Marion. Balgowlah, NSW: Reed Books. ISBN 0-7301-0355-2.
- Sugar glider — Atlas of Living Australia
- Sugar glider — Wildlife Preservation Society of Queensland
- Gliders in the Spotlight — Wildlife Preservation Society of Queensland
- ITIS report: Petaurus breviceps — Taxon classification verified by ITIS
- Petaurus breviceps — Animal Diversity Web
- VIDEOS: sugar gliders in the wild on ARKive.org — BBC Natural History Unit
- Enlargement of Petaurus breviceps skull — Museum Victoria, Bioinformatics (photo showing sugar gliders' unusual dentition)