|In Cairns, Australia|
The Bush Stone-curlew or Bush Thick-knee (Burhinus grallarius, obsolete name Burhinus magnirostris) is a large[clarification needed], ground-dwelling bird endemic to Australia. Although it looks rather like a wader and is related to the oystercatchers, avocets and plovers, it is a terrestrial predator filling an ecological niche similar to that of the roadrunners of North America.
Like most stone-curlews, it is mainly nocturnal and specialises in hunting small grassland animals: frogs, spiders, insects, molluscs, crustaceans, snakes, lizards and small mammals are all taken, mostly gleaned or probed from soft soil or rotting wood; also a few seeds or tubers, particularly in drought years. Birds usually forage individually or in pairs over a large home range, particularly on moonlit nights.
During the day, Bush Stone-curlews tend to remain inactive, sheltering amongst tall grass or low shrubs and relying on their cryptic plumage to protect them from predators. When disturbed, they freeze motionless, often in odd-looking postures. For visual predators like raptors (and humans), this works well, but it serves little purpose with animals that hunt by scent such as foxes, dingoes or goannas.
Despite their ungainly appearance and habit of freezing motionless, they are sure-footed, fast and agile on the ground, and although they seldom fly during daylight hours, they are far from clumsy in the air; flight is rapid and direct on long, broad wings.
The Bush Stone-curlew is probably heard more than it is seen. Its call sounds like a wail or a scream in the night. When scared, it screeches – a sound similar to the screech of a possum. When threatened (presumably in the presence of a nest), they may raise their wings wide and high in an impressive threat posture and emit a loud, hoarse hissing noise.
Distribution and habitat
The Bush Stone-curlew lives in open woodland, edges of forest, and along inland watercourses, demonstrating broad habitat preferences. It is still abundant in parts of the tropical north but it is approaching extinction in pastoral areas in the south where once it was common.
Bush Stone-curlews remain reasonably common in the north of Australia, but have become rare in the less fertile south. Many experts believe that fox predation is a prime factor in their decline, however there are areas where foxes are common yet the Bush Stone-curlew population remains healthy, so the true causes remain uncertain. Large-scale habitat destruction and fragmentation has undoubtedly been important, and may well be the major factor, although there is some evidence that suggests that the species clearly favours agricultural land with patches of remnant native vegetation over intact areas of vegetation.
Bush Stone Curlew is not listed as threatened on the Environment Protection and Biodiversity Conservation Act 1999. It is common in Queensland, and not considered to be regionally threatened there. In the Central Coast of New South Wales it is considered endangered under the Threatened Species Conservation Act 1995. Bush Stone Curlew are listed as "threatened" on the Victorian Flora and Fauna Guarantee Act 1988. Under this Act, an Action Statement for the recovery and future management of this species has been prepared. On the 2007 advisory list of threatened vertebrate fauna in Victoria, this species is listed as endangered.
At Perth Zoo, Australia
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- BirdLife International (2012). "Burhinus grallarius". IUCN Red List of Threatened Species. Version 2013.2. International Union for Conservation of Nature. Retrieved 26 November 2013.
- Denise Lawungkurr Goodfellow (2005). Birds of Australia's Top End. Frenchs Forest, New South Wales: Reed New Holland. p. 68. ISBN 1-877069-19-1.
- Gates, J.A.; Paton, D.C. (2005). "The distribution of Bush Stone-curlews (Burhinus grallarius) in South Australia, with particular reference to Kangaroo Island". Emu 105 (3): 241–247. doi:10.1071/MU02029.
- Department of Sustainability and Environment, Victoria at the Wayback Machine (archived July 18, 2005)
- Department of Sustainability and Environment, Victoria at the Wayback Machine (archived September 11, 2006)
- Victorian Department of Sustainability and Environment (2007). Advisory List of Threatened Vertebrate Fauna in Victoria – 2007. East Melbourne, Victoria: Department of Sustainability and Environment. p. 15. ISBN 978-1-74208-039-0.