The Australian tern or Australian gull-billed tern (Gelochelidon macrotarsa) is a tern in the family Laridae. The genus name is from Ancient Greek gelao, "to laugh", and khelidon, "swallow". It was previously considered conspecific with the gull-billed tern.
This is a fairly large and powerful tern, similar in size and general appearance to a Sandwich tern, but the short thick gull-like bill, broad wings, long legs and robust body are distinctive. The summer adult has grey upperparts, white underparts, a black cap, strong black bill and black legs. The call is a characteristic ker-wik. It is 33–42 cm (13–17 in) in length and 76–91 cm (30–36 in) in wingspan. Body mass ranges from 150–292 g (5.3–10.3 oz).
In winter, the cap is lost, and there is a dark patch through the eye like a Forster's tern or a Mediterranean gull. Juvenile Australian terns have a fainter mask, but otherwise look much like winter adults.
This species breeds in colonies on lakes, marshes and coasts. It nests in a ground scrape and lays two to five eggs.
The Australian gull-billed tern does not normally plunge dive for fish like the other white terns, and has a broader diet than most other terns. It largely feeds on insects taken in flight, and also often hunts over wet fields and even in brushy areas, to take amphibians and small mammals. It is also an opportunistic feeder, and has been observed to pick up and feed on dead dragonflies from the road.
- BirdLife International 2018. Gelochelidon macrotarsa. The IUCN Red List of Threatened Species 2018: e.T62026537A132671766. https://doi.org/10.2305/IUCN.UK.2018-2.RLTS.T62026537A132671766.en. Downloaded on 23 June 2019.
- Gould, John (1837). "Characters of New Species of Australian Birds". Proceedings of the Zoological Society of London. 5: 24=35 .
- "Gull-billed Tern". All About Birds. Cornell Lab of Ornithology.
- "Gull billed Tern (Gelochelidon nilotica)". Planet of Birds. 2011. Archived from the original on 2019-06-23. Retrieved 2019-06-23.
- Dunning, John B. Jr., ed. (1992). CRC Handbook of Avian Body Masses. CRC Press. ISBN 978-0-8493-4258-5.
- Sivakumar, S. (2004). "Gull-billed Tern Gelochelidon nilotica (Gmelin, 1789) feeding on insect road kills" (PDF). Newsletter for Ornithologists. 1 (1–2): 18–19.