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- 243 Ida
- 1949 Ambato earthquake
- The 1975 (song)
- 2002 Bou'in-Zahra earthquake
- 2005 Qeshm earthquake
- 2008 World Science Festival
- 90377 Sedna
- Earth-grazing meteoroid of 13 October 1990
- A History of British Fishes
- Abberton Reservoir
- Aberfan disaster
- Abuwtiyuw
- Acacia pycnantha
- Acamptonectes
- Acetic acid
- Achelousaurus
- Acra (fortress)
- Acrocanthosaurus
- AdS/CFT correspondence
- Adenanthos cuneatus
- Adenanthos obovatus
- Adiantum viridimontanum
- African crake
- African river martin
- Agaricus deserticola
- Ai-Khanoum
- 1995 Aigio earthquake
- Ailanthus altissima
- Aiphanes
- Akodon spegazzinii
- Albatrellus subrubescens
- Albertosaurus
- Alcathoe bat
- Aleeta curvicosta
- Allison Guyot
- Allosaurus
- Alloxylon flammeum
- Alloxylon pinnatum
- Alpine chough
- Alpine ibex
- Alpine newt
- Amanita bisporigera
- Amanita muscaria
- Amanita ocreata
- Amanita phalloides
- Amargasaurus
- Ambondro mahabo
- Ambulocetus
- American Beauty (1999 film)
- American Cream Draft
- American goldfinch
- American paddlefish
- American white ibis
- Amphetamine
- Amphibian
- Amundsen's South Pole expedition
- Ancient Egypt
- Andalusian horse
- Andean condor
- Andromeda (constellation)
- Angkor Wat
- Ankylosaurus
- Mary Anning
- Ant
- Antbird
- Anti-tobacco movement in Nazi Germany
- Antlia
- Apatosaurus
- Apollo 4
- Apollo 5
- Apollo 6
- Apollo 7
- Apollo 8
- Apollo 9
- Apollo 10
- Apollo 11 50th Anniversary commemorative coins
- Apollo 11
- Apollo 12
- Apollo 13
- Apollo 14
- Apollo 15
- Apollo 16
- Apollo 17
- Apororhynchus
- Appaloosa
- Apus
- Archaea
- Archaeoindris
- Archaeology, Anthropology, and Interstellar Communication
- Archaeopteryx
- Archimedes
- Arctic tern
- Argentinosaurus
- Ariel (moon)
- Aries (constellation)
- Armero tragedy
- Armillaria gallica
- Armillaria luteobubalina
- Lilias Armstrong
- Aspasia
- Astatine
- Asteroid belt
- Astraeus hygrometricus
- Asylum confinement of Christopher Smart
- Atlantic puffin
- Atmosphere of Jupiter
- Auriga (constellation)
- Auriscalpium vulgare
- Australasian Antarctic Expedition
- Australasian gannet
- Australian Cattle Dog
- Australian boobook
- Australian green tree frog
- Australian magpie
- Australian raven
- Australiformis
- Aylesbury duck
- Cerro Azul (Chile volcano)
- Babakotia
- Bacteria
- Bajadasaurus
- Bald eagle
- Baleen whale
- Banded broadbill
- Banded stilt
- Banded sugar ant
- Banker horse
- Banksia cuneata
- Banksia integrifolia
- Banksia menziesii
- Banksia paludosa
- Banksia sessilis
- Banksia aculeata
- Banksia aemula
- Banksia aquilonia
- Banksia attenuata
- Banksia blechnifolia
- Banksia brownii
- Banksia caleyi
- Banksia canei
- Banksia coccinea
- Banksia dentata
- Banksia epica
- Banksia ericifolia
- Banksia grossa
- Banksia ilicifolia
- Banksia lemanniana
- Banksia marginata
- Banksia oblongifolia
- Banksia petiolaris
- Banksia prionotes
- Banksia scabrella
- Banksia sceptrum
- Banksia serrata
- Banksia speciosa
- Banksia sphaerocarpa
- Banksia spinulosa
- Banksia telmatiaea
- Banksia verticillata
- Banksia violacea
- Ann Bannon
- Barbara L
- Barkhale Camp
- Barn owl
- Barn swallow
- Barnard's Star
- Baryonyx
- Bat
- Beagle
- Beaver
- Bee-eater
- Belle Vue Zoological Gardens
- Benty Grange hanging bowl
- Benty Grange helmet
- Beringian wolf
- Mount Berlin
- Betelgeuse
- Beulé Gate
- Bharattherium
- Biblioteca Marciana
- Bird
- Golding Bird
- Birthday-number effect
- Bivalvia
- Black-and-red broadbill
- Black-and-yellow broadbill
- Black-breasted buttonquail
- Black currawong
- Black honeyeater
- Black-necked grebe
- Black-shouldered kite
- Black stork
- Black-throated loon
- Black vulture
- Anna Blackburne
- Blakeney Point
- Blindfold Me
- Blue-faced honeyeater
- Blue iguana
- Blue whale
- Bluebuck
- Bobcat
- Bodiam Castle
- Bog turtle
- Bohemian waxwing
- Niels Bohr
- Boletus aereus
- Boletus edulis
- Bone Sharps, Cowboys, and Thunder Lizards
- Bone Wars
- Boring Lava Field
- Borobudur
- Boulonnais horse
- Matthew Boulton
- James E. Boyd (scientist)
- Brachiosaurus
- Brachychiton rupestris
- Guy Bradley
- Brazza's martin
- British nuclear tests at Maralinga
- Broad-billed parrot
- Brougham Castle
- Brown Dog affair
- William Robinson Brown
- Bryce Canyon National Park
- Buckton Castle
- Bupropion
- Buruli ulcer
- Vannevar Bush
- Cabbage
- Cactus wren
- Caelum
- Caesium
- Calabozos
- Calgary Stampede
- California condor
- California gold rush
- Californium
- Callisto (moon)
- Caloboletus calopus
- Calostoma cinnabarinum
- Calutron
- Calvatia sculpta
- Camas pocket gopher
- Canada jay
- Canada lynx
- Candy (Foxy Brown song)
- Cane toad
- Canis Major
- Canis Minor
- Cape sparrow
- Capella
- Carnaby's black cockatoo
- Carnotaurus
- Rachel Carson
- Castle
- Cat's Eye Nebula
- Catopsbaatar
- Cattle egret
- Ceratosaurus
- Cerebellum
- Ceres (dwarf planet)
- Cerro Blanco (volcano)
- Cetiosauriscus
- James Chadwick
- Chagas disease
- Chalciporus piperatus
- Chat Moss
- Cherry Springs State Park
- Chestnuts Long Barrow
- Chicado V
- Chicago Pile-1
- Chicxulub crater
- V. Gordon Childe
- Choiseul pigeon
- Cholangiocarcinoma
- Chorioactis
- Chrysiridia rhipheus
- Cimoliopterus
- Circinus
- Clathrus ruber
- Cleveland Bay
- Cleveland Street scandal
- Cley Marshes
- Climate change
- Clinton Engineer Works
- Clonmacnoise Crozier
- Coccinellidae
- Cockatoo
- Coeliac disease
- Coffin Stone
- Coldrum Long Barrow
- Columbian mammoth
- Combe Hill, East Sussex
- Common chiffchaff
- Common firecrest
- Common raven
- Common starling
- Common tern
- Common toad
- Complete blood count
- Compsognathus
- James B. Conant
- Confirmation bias
- Conservation of slow lorises
- Cooperative pulling paradigm
- Edward Drinker Cope
- Coprinellus micaceus
- Corn crake
- Corona Australis
- Corona Borealis
- Coropuna
- Corp Naomh
- Cortinarius caperatus
- Cortinarius violaceus
- Corvus (constellation)
- Cougar
- Crater (constellation)
- Craters of the Moon National Monument and Preserve
- O. G. S. Crawford
- Crescent honeyeater
- Cretaceous–Paleogene extinction event
- Cretoxyrhina
- Crocodilia
- Cryptoprocta spelea
- Cuban macaw
- Cucurbita
- Cutthroat trout
- Cyathus
- Cygnus X-1
- DNA
- DNA nanotechnology
- Dark Archives
- Charles Darwin
- Daspletosaurus
- Homer Davenport
- Definition of planet
- Deinocheirus
- Deinonychus
- Deinosuchus
- Delichon
- Dementia with Lewy bodies
- Dendrocollybia
- Dengue fever
- Dermotherium
- Diamond
- Did You Hear What Happened to Charlotte King?
- Diffuse panbronchiolitis
- Dilophosaurus
- Dinosaur
- Diodorus scytobrachion
- Diplodocus
- Dire wolf
- Discovery Expedition
- Discovery of nuclear fission
- Discovery of the tomb of Tutankhamun
- Dodo
- Marjory Stoneman Douglas
- Rupert Downes
- Dracophyllum fiordense
- Draining and development of the Everglades
- Dromaeosauroides
- Drosera regia
- Drymoreomys
- Dubnium
- Bud Dunn
- Duriavenator
- Durrell's vontsira
- Dwarf planet
- Earth
- Eastern brown snake
- Easy Jet (horse)
- Echo parakeet
- Ediacaran biota
- Edmontosaurus
- Edmontosaurus mummy AMNH 5060
- Henry Edwards (entomologist)
- Mount Edziza volcanic complex
- Egyptian temple
- Jürgen Ehlers
- El Tatio
- Elasmosaurus
- Electric eel
- Electron
- Elephant
- Elfin woods warbler
- Elk
- Emesa helmet
- Emperor penguin
- Emu
- Enceladus
- Endometrial cancer
- Entoloma sinuatum
- Enzyme
- Enzyme kinetics
- Enzyme inhibitor
- Epacris impressa
- Epsilon Eridani
- Eremoryzomys
- Eris (dwarf planet)
- Escalera's bat
- Lake Estancia
- Eta Carinae
- Leonhard Euler
- Eurasian blackcap
- Eurasian crag martin
- Eurasian nuthatch
- Eurasian tree sparrow
- Eurasian treecreeper
- Europa (moon)
- European hare
- European nightjar
- European rock pipit
- European storm petrel
- Euryoryzomys emmonsae
- Everywhere at the End of Time
- Evolution
- Evolution of lemurs
- Exelon Pavilions
- Exhumation and reburial of Richard III of England
- Exosome complex
- An Experiment on a Bird in the Air Pump
- Exsudoporus frostii
- Eye (cyclone)
- Neil Hamilton Fairley
- Peregrine falcon
- False potto
- Ray Farquharson
- Fauna of Scotland
- Female genital mutilation
- Enrico Fermi
- Fertilisation of Orchids
- Ferugliotheriidae
- Ferugliotherium
- Richard Feynman
- Ficus aurea
- Ficus macrophylla
- Ficus obliqua
- Ficus rubiginosa
- Fiji parrotfinch
- Fir Clump Stone Circle
- First homosexual movement
- Five Nights at Freddy's (video game)
- Flame robin
- Flight feather
- Flocke
- Flora of Madagascar
- Howard Florey
- Fluorine
- Eunice Newton Foote
- Forest raven
- Fork-marked lemur
- Formation and evolution of the Solar System
- Georg Forster
- Fort Dobbs (North Carolina)
- Fossa (animal)
- Francium
- Frank's Cock
- Ursula Franklin
- Freedom Planet
- Frigatebird
- Frilled lizard
- Frog
- Fuck (2005 film)
- Fuck: Word Taboo and Protecting Our First Amendment Liberties
- Fulvous whistling duck
- Funerary art
- Fungus
- GRB 970508
- Galápagos tortoise
- Galaxy
- Galerina marginata
- Gallimimus
- Gamma-ray burst
- Ganymede (moon)
- Garden warbler
- Ronnie Lee Gardner
- Ben Gascoigne
- Geastrum quadrifidum
- Geastrum triplex
- Gender Bender (The X-Files)
- General relativity
- Introduction to general relativity
- Genetics
- Geography and ecology of the Everglades
- Geology of the Lassen volcanic area
- Geology of the Grand Canyon area
- Geology of the Zion and Kolob canyons area
- Germanium
- Gertie the Dinosaur
- Getting It: The Psychology of est
- Gevninge helmet fragment
- Giant anteater
- Giant eland
- Giant mouse lemur
- Giant otter
- Josiah Willard Gibbs
- Giganotosaurus
- Gigantorhynchus
- Giraffe
- Harry Glicken
- Gliding
- Globular cluster
- Go Man Go
- Goblin shark
- Goldcrest
- Golden-crowned sifaka
- Golden jackal
- Golden swallow
- Golden white-eye
- The Goldfinch (painting)
- Gomphus clavatus
- Gorgosaurus
- Grasshopper
- Gray mouse lemur
- GRB 970228
- Great Stink
- Great auk
- Great spotted woodpecker
- Greater crested tern
- Debora Green
- Green rosella
- Grevillea juniperina
- Grey-cowled wood rail
- Grey currawong
- Gropecunt Lane
- Grus (constellation)
- Guadeloupe amazon
- Guallatiri
- Guilden Morden boar
- Gurl.com
- Gymnopilus maritimus
- Gyromitra esculenta
- H II region
- Haflinger
- Comet Hale–Bopp
- Halley's Comet
- Ham Wall
- Hammond's rice rat
- Hanford Site
- Hare coursing
- Harris's List of Covent Garden Ladies
- Fairfax Harrison
- Hartebeest
- Hassium
- Haumea
- Heavy metals
- Princess Helena of the United Kingdom
- Helicobacter pylori
- Helium
- George Went Hensley
- Hepatorenal syndrome
- Herbig–Haro object
- Herrerasaurus
- Heterodontosaurus
- Hippocampus
- Hippopotamus
- History of biology
- History of evolutionary thought
- History of Mars observation
- History of timekeeping devices
- History of Chincoteague, Virginia
- History of aluminium
- A History of the Birds of Europe
- Holkham National Nature Reserve
- Tom Holland
- Oliver Wendell Holmes Sr.
- Homo antecessor
- Hooded pitohui
- Hoodoo Mountain
- Hoopoe starling
- Hoover Dam
- Horizon Guyot
- Horncastle boar's head
- Horned sungem
- Horologium (constellation)
- Tabanidae
- Horse Protection Act of 1970
- Horses in World War I
- Horseshoe bat
- Hoxne Hoard
- Huaynaputina
- Hubble Deep Field
- Hubble Space Telescope
- Huia
- Humpback whale
- James Humphreys (pornographer)
- Comet Hyakutake
- Hydnellum peckii
- Hydnum repandum
- Hydrogen
- Β-Hydroxy β-methylbutyric acid
- Hydrus
- Hygrophoropsis aurantiaca
- Hypericum sechmenii
- I Never Liked You
- IK Pegasi
- Ice core
- Ice drilling
- Icelandic horse
- Icelandic Phallological Museum
- Ichthyovenator
- Icos
- Iguanodon
- 1968 Illinois earthquake
- Illustrations of the Family of Psittacidae, or Parrots
- Imleria badia
- Immune system
- Impala
- Imperator torosus
- Imperial Trans-Antarctic Expedition
- Inaccessible Island rail
- Incapillo
- Indian roller
- Influenza
- Inocybe saliceticola
- Invisible rail
- Io (moon)
- Irritator
- Island of stability
- Isopoda
- Isopogon anemonifolius
- Isopogon anethifolius
- Istiodactylus
- JC's Girls
- Jack the Ripper
- Jaekelopterus
- Jaguar
- Jameson's mamba
- Japanese fire-bellied newt
- Javan rhinoceros
- Javan slow loris
- Jersey Act
- Jersey Shore shark attacks of 1916
- Magic Johnson
- David A. Johnston
- Joppenbergh Mountain
- Jupiter trojan
- Kamaʻehuakanaloa Seamount
- Panagiotis Kavvadias
- Kelenken
- Johannes Kepler
- Kererū
- Ketogenic diet
- Killdeer
- King Island emu
- King brown snake
- King vulture
- Knap Hill
- Knut (polar bear)
- Koala
- Kosmoceratops
- Kreutz sungrazer
- Theodora Kroeber
- Kronan (ship)
- Kuiper belt
- Lactarius indigo
- Lactarius torminosus
- Lactifluus volemus
- Laevistrombus canarium
- Laguna del Maule (volcano)
- Laika
- Mathew Charles Lamb
- Lambeosaurus
- Lambertia formosa
- Laplace–Runge–Lenz vector
- Lavanify
- Lead
- Leech
- Etta Lemon
- Lemur
- Lemurs of Madagascar (book)
- Leo Minor
- Leopold Report
- Lesser Antillean macaw
- Letter-winged kite
- Lettuce
- Leucippus
- Level Mountain
- Lightning Bar
- Limalok
- Limusaurus
- Lindow Man
- Linezolid
- Lion
- Literary Hall
- Lives of the Most Eminent Literary and Scientific Men
- The Livestock Conservancy
- Livyatan
- Loggerhead sea turtle
- Long-tailed ground roller
- Low Memorial Library
- Lundomys
- Lung cancer
- Glynn Lunney
- Lycoperdon echinatum
- Lycoperdon perlatum
- Lynx (constellation)
- Marcus Ward Lyon Jr.
- Lythronax
- M-theory
- MAUD Committee
- Macaroni penguin
- Madeira firecrest
- Magnetosphere of Jupiter
- Maiden Castle, Dorset
- Main sequence
- Major depressive disorder
- Major urinary proteins
- Majungasaurus
- Makemake
- Malagasy mountain mouse
- The Man in the Moone
- Mandrill
- Mangrove swallow
- 1867 Manhattan, Kansas earthquake
- Manhattan Project
- Manta ray
- Mantis
- Maple syrup
- Marasmius rotula
- Markham's storm petrel
- Mars in fiction
- Mars
- Marsh rice rat
- Bob Marshall (wilderness activist)
- Marwari horse
- Mary Rose
- Herbert Maryon
- Mascarene grey parakeet
- Mascarene martin
- Mascarene parrot
- Masked booby
- Masked shrike
- Massospondylus
- Mauna Kea
- Mauna Loa
- Mauritius blue pigeon
- Mauritius sheldgoose
- Maya stelae
- Mayfly
- Mount Mazama
- Barbara McClintock
- Frances Gertrude McGill
- Mechanical filter
- Meerkat Manor
- Meerkat Manor: The Story Begins
- Megabat
- Megalodon
- Megalograptus
- Megarachne
- Meningitis
- Mensa (constellation)
- Menstrual cycle
- Mercury (planet)
- Mesopropithecus
- Olivier Messiaen
- Messier 87
- Metabolism
- Metacomet Ridge
- Metalloid
- Microscopium
- Millipede
- Mimodactylus
- Mini scule
- Miniopterus aelleni
- Miniopterus griveaudi
- RSPB Minsmere
- Mirror symmetry (string theory)
- Miss Meyers
- Mistle thrush
- Mono–Inyo Craters
- Marilyn Monroe
- Montreal Laboratory
- Moon
- Morchella rufobrunnea
- Mosasaurus
- Meinhard Michael Moser
- Mount Cayley volcanic field
- Mount Melbourne
- Mountain pigeon
- Mourning dove
- Jessie Murray
- Margaret Murray
- Musca
- Mycena aurantiomarginata
- Mycena haematopus
- Myriostoma
- Florence Nagle
- Name-letter effect
- Nature fakers controversy
- Nauru reed warbler
- 2007–2008 Nazko earthquakes
- Nebular hypothesis
- Elizabeth Needham
- Nemegtomaia
- Neptune
- Netley Abbey
- Nevado del Ruiz
- Hugh de Neville
- New Forest pony
- 1966 New York City smog
- Newberry Volcano
- Newton's parakeet
- Nico Ditch
- Nicotinamide adenine dinucleotide
- Nigersaurus
- Nihonium
- Nimrod Expedition
- Nine Stones, Winterbourne Abbas
- Niobium
- Noble gas
- Emmy Noether
- Noisy miner
- Nominative determinism
- Norma (constellation)
- Norman Cob
- Noronha skink
- Noronhomys
- North Island (Houtman Abrolhos)
- North Norfolk Coast Site of Special Scientific Interest
- North Ronaldsay sheep
- Northern bald ibis
- Northern gannet
- Northern pintail
- Northern rosella
- Northern voalavo
- Norton Priory
- Nothomyrmecia
- Lisa Nowak
- Nuthatch
- Nyctibatrachus major
- Oberon (moon)
- Ocean sunfish
- Oceanic whitetip shark
- Octopus
- Offham Hill
- Oganesson
- Ohmdenosaurus
- Ojos del Salado
- Old Exe Bridge
- Mark Oliphant
- Olmec colossal heads
- Olympic marmot
- Omphalotus nidiformis
- On the Origin of Species
- Gerard K. O'Neill
- Onychopterella
- Oort cloud
- Opisthocoelicaudia
- J. Robert Oppenheimer
- Oppenheimer security clearance hearing
- Orangutan
- Orca
- Orion (mythology)
- Oryzomys
- Oryzomys antillarum
- Oryzomys couesi
- Oryzomys dimidiatus
- Oryzomys gorgasi
- Oryzomys peninsulae
- Osteochondritis dissecans
- Oxalaia
- Oxidative phosphorylation
- Oxygen
- Oxygen toxicity
- Pacific blue-eye
- Pacific swift
- Painted turtle
- Pale crag martin
- Paleocene
- Pali-Aike volcanic field
- Pallas's leaf warbler
- Pallid sturgeon
- Pancreatic cancer
- Panellus stipticus
- Papuan mountain pigeon
- Paraceratherium
- Paranthodon
- Parasaurolophus
- Jack Parsons
- Passenger pigeon
- Pavo (constellation)
- Paxillus involutus
- Payún Matrú
- Pedro II of Brazil
- Pelican
- Peloneustes
- Pennatomys
- Percheron
- Perijá tapaculo
- Periodic table
- Perseus (constellation)
- Persoonia lanceolata
- Persoonia levis
- Persoonia linearis
- Persoonia terminalis
- Petrified Forest National Park
- Petter's big-footed mouse
- Phagocyte
- Phallus indusiatus
- Phellinus ellipsoideus
- Phoenix (constellation)
- Phosphatodraco
- Pictor
- Pied butcherbird
- Pied currawong
- Pigeon photography
- Pigeon guillemot
- Pigeye shark
- Pinguicula moranensis
- Pinniped
- Pioneer Helmet
- Pipistrellus raceyi
- Pitta
- Kyriakos Pittakis
- Planet Nine
- Planet
- Planets beyond Neptune
- Plateosaurus
- Platypus
- Plesiorycteropus
- Pluto
- Plutonium
- Podokesaurus
- Poitevin horse
- Polar bear
- Polio
- Political Animals and Animal Politics
- Polyozellus
- Porbeagle
- Porlock Stone Circle
- Preening
- Solo Man
- Mount Price (British Columbia)
- Joseph Priestley
- Primate
- Private Case
- Procellariidae
- Proxima Centauri
- Przevalski's nuthatch
- Pseudoryzomys
- Psilocybe aztecorum
- Psilocybe semilanceata
- Psittacosaurus
- Puerto Rican amazon
- Pulmonary contusion
- Push the Button (Sugababes song)
- Pygmy hippopotamus
- Pyxis
- Qatna
- 1997 Qayen earthquake
- Qibla
- Quagga
- Quark
- Queen angelfish
- Quiriguá
- RNA interference
- RSPB Dearne Valley Old Moor
- Isidor Isaac Rabi
- Raccoon
- Race Against Time (Lewis book)
- Radiocarbon dating
- Rainbow pitta
- Rainbow trout
- 1984 Rajneeshee bioterror attack
- Ramaria botrytis
- Rampart Dam
- Raptor Red
- Rastafari
- Red-backed fairywren
- Red-bellied black snake
- Red-billed chough
- Red-billed quelea
- Red-billed tropicbird
- Red-capped parrot
- Red-capped robin
- Red-headed myzomela
- Red-necked grebe
- Red panda
- Red rail
- Red-tailed black cockatoo
- Red-tailed tropicbird
- Red-throated loon
- Red-throated wryneck
- Red warbler
- Red wattlebird
- Red-winged fairywren
- Redback spider
- Redshift
- Renewable energy in Scotland
- Judith Resnik
- Resolution Guyot
- Restoration of the Everglades
- Resurrectionists in the United Kingdom
- Réunion ibis
- Réunion swamphen
- Rhabdomyolysis
- Rhodocene
- Rhodotus
- Rhyolite, Nevada
- Sally Ride
- Rigel
- Right whale
- Ring ouzel
- Ring-tailed lemur
- Rings of Jupiter
- Rings of Uranus
- Rings of Neptune
- Rock martin
- Rock parrot
- Rodent
- Rodrigues night heron
- Rodrigues parrot
- Rodrigues solitaire
- Rodrigues starling
- Roman temple of Bziza
- Ludwig Ross
- Rotating locomotion in living systems
- Rotavirus
- Roxy Ann Peak
- Ruff (bird)
- Ruffed lemur
- Rufous-crowned sparrow
- Martin Rundkvist
- Russet sparrow
- Russula emetica
- Russula virescens
- Russulaceae
- John/Eleanor Rykener
- William S. Sadler
- Sagitta
- St. Croix macaw
- La Salute è in voi
- Salvia yangii
- 1257 Samalas eruption
- Omayra Sánchez
- S&M (song)
- Sarcophagus of Eshmunazar II
- Sarcoscypha coccinea
- Saturn
- Saxaul sparrow
- Scarlet myzomela
- Scattered disc
- Schizophrenia
- Scorpion
- Scout Moor Wind Farm
- Sea mink
- Sea otter
- Seacology
- Secretarybird
- Segnosaurus
- Senghenydd colliery disaster
- Seorsumuscardinus
- Serpens
- Serpin
- Sexuality after spinal cord injury
- Seychelles parakeet
- Shackleton–Rowett Expedition
- Shale oil extraction
- She Shoulda Said No!
- Joseph Francis Shea
- Sheep
- Shen Kuo
- Comet Shoemaker–Levy 9
- Short-beaked echidna
- Shorwell helmet
- Siamosaurus
- Siberian accentor
- Silky sifaka
- Sind sparrow
- Sirius
- Sissinghurst Castle Garden
- Slate industry in Wales
- Louis Slotin
- Small-toothed sportive lemur
- Smilodon
- Smooth newt
- Smooth toadfish
- Smyth Report
- Smythe's Megalith
- Snoring rail
- Snowy plover
- Social history of viruses
- Solar eclipse
- Solar System
- Somerset Levels
- Song dynasty
- Song thrush
- Sonic X
- Sonic the Hedgehog
- South Asian river dolphin
- Speed of light
- Spinophorosaurus
- Splendid fairywren
- Spotted green pigeon
- Springbok
- 1980 eruption of Mount St. Helens
- Star
- Starfish
- William T. Stearn
- Gwen Stefani
- Stegoceras
- Stegosaurus
- Steller's sea cow
- The Story of Miss Moppet
- Strepsirrhini
- Styracosaurus
- Subarachnoid hemorrhage
- Subfossil lemur
- Suffolk Punch
- Suillellus luridus
- Suillus bovinus
- Suillus brevipes
- Suillus luteus
- Suillus pungens
- Suillus salmonicolor
- Suillus spraguei
- Kathryn D. Sullivan
- Sumatran rhinoceros
- Sun
- Sun in fiction
- Superb fairywren
- Supernova
- Surtsey
- Sustainable energy
- Sweet Track
- The Swimming Hole
- Symphyotrichum lateriflorum
- Synthetic diamond
- TRAPPIST-1
- Taapaca
- Taare Zameen Par
- Tahiti rail
- Mount Takahe
- Takalik Abaj
- Tammar wallaby
- Bazy Tankersley
- Tarbosaurus
- Tasmanian devil
- Paul Nobuo Tatsuguchi
- Tau Ceti
- Tawny owl
- Taxonomy of lemurs
- Technetium
- Teleost
- Telescopium
- Edward Teller
- Telopea oreades
- Telopea speciosissima
- Telopea truncata
- Teloschistaceae
- Temple of Eshmun
- Tennessine
- Tern
- Terra Nova Expedition
- Thalassodromeus
- The Trundle
- Teresa Cristina of the Two Sicilies
- Thescelosaurus
- Thomasomys ucucha
- Thomcord
- Thopha saccata
- Thorium
- Thoroughbred
- Three Sisters (Oregon)
- Thunder (mascot)
- Thylacine
- Thyrotoxic periodic paralysis
- Time in Finland
- Titan (moon)
- Titania (moon)
- Titanis
- Titchwell Marsh
- Ignace Tonené
- Toothcomb
- Toronto Magnetic and Meteorological Observatory
- Torture
- Tourette syndrome
- Trait du Nord
- Transandinomys
- Transandinomys bolivaris
- Transandinomys talamancae
- Tree swallow
- John Treloar (museum administrator)
- Triaenops menamena
- Triangulum Australe
- Triangulum
- Triceratops
- Tricholoma pardinum
- Trinity (nuclear test)
- Triton (moon)
- Triturus
- Trocaz pigeon
- Harry R. Truman
- Tucana
- Tufted jay
- Tumbler Ridge
- Turbinellus floccosus
- Turkey vulture
- Emma Louisa Turner
- Turquoise parrot
- Turtle
- Tutupaca
- Cerro Tuzgle
- Tylopilus felleus
- Tyrannosaurus
- Ubinas
- Umbriel (moon)
- Upper and Lower Table Rock
- Uranus
- Ursa Minor
- Uturuncu
- Edvard August Vainio
- Cherry Valentine
- Variegated fairywren
- Vasa (ship)
- Vega
- Velociraptor
- Venus
- Venus in fiction
- Verbascum thapsus
- Vermilion flycatcher
- Verpa bohemica
- Viatkogorgon
- Virus
- Introduction to viruses
- Voalavo
- Barry Voight
- Volcanism on Io
- Volcano (South Park)
- The Volcano (British Columbia)
- Volubilis
- Alfred Russel Wallace
- Warwick Castle
- Water fluoridation
- Water pipit
- Water rail
- Well he would, wouldn't he?
- Wells and Wellington affair
- Western house martin
- Western jackdaw
- Western yellow robin
- Mortimer Wheeler
- The Whistleblower
- Ryan White
- White-bellied sea eagle
- White-breasted nuthatch
- White dwarf
- White-eyed river martin
- White-headed fruit dove
- White-naped xenopsaris
- White-necked rockfowl
- White-rumped swallow
- White stork
- White swamphen
- White-winged fairywren
- Whitechapel murders
- Nigel Williams (conservator)
- Willie wagtail
- Francis Willughby
- Withypool Stone Circle
- Wolf
- Wood stork
- Woolly mammoth
- The World Without Us
- Wōdejebato
- X-10 Graphite Reactor
- Xenon
- Xerochrysum bracteatum
- Xeromphalina setulipes
- Xixiasaurus
- Robert Sterling Yard
- Yellow-faced honeyeater
- Yellow-tailed black cockatoo
- Yellowhammer
- Yogo sapphire
- Yttrium
- Yukon Quest
- ZETA (fusion reactor)
- Zapata rail
- Zebra
- Zhang Heng
- Zinc
- Zino's petrel
- Common blackbird
- Slow loris
- Black mamba
- Eastern green mamba
- Rodrigues rail
- Silky shark
- Peter van Geersdaele