White-headed stilt
| White-headed stilt | |
|---|---|
 | |
| Adult | |
| Scientific classification | |
| Kingdom: | Animalia |
| Phylum: | Chordata |
| Class: | Aves |
| Order: | Charadriiformes |
| Suborder: | Charadrii |
| Family: | Recurvirostridae |
| Genus: | Himantopus |
| Species: | H. leucocephalus |
| Binomial name | |
| Himantopus leucocephalus Gould, 1837 | |
| Synonyms | |
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The white-headed stilt (Himantopus leucocephalus) is a bird in the family Recurvirostridae. It is sometimes considered a subspecies of the black-winged stilt (H. himantopus). This shorebird has been recorded from Malaysia, Japan, the Philippines, Brunei, Christmas Island, Indonesia, Palau, Papua New Guinea, Australia and New Zealand.
Description
The white-headed stilt grows to a length of about 14 in (36 cm) with a wingspan of about 26.5 in (67 cm). The back of the head and neck, the back and the upper surfaces of the wings are glossy greenish-black. The undersides of the wings are plain black and the remainder of the plumage is white, apart from the tail feathers which are tinged with grey. The long, thin legs are pink and the toes have black claws. The long slender beak is black and the irises and the eyelids are red.[2]
Distribution
The white-headed stilt is resident in southern Sumatra, Java, Sulawesi and most of Australia and New Zealand. There are non-breeding populations in Sri Lanka, the Philippines, Brunei, Palau, South Kalimantan, West Nusa Tenggara, East Nusa Tenggara, East Timor and New Guinea.[3] This bird is a vagrant to Japan and Christmas Island.[1]
Behaviour
The white-headed stilt is a waterbird and feeds in shallow water, probing into the sediment with its beak. It is gregarious and in New Zealand sometimes forms mixed flocks with the black stilt (Himantopus novaezelandiae),[2] a bird now critically endangered.[4] It feeds largely on aquatic insects and on small molluscs. It emits a repeated yelping cry as it flies and the legs trail behind it, tending to sway from side-to-side.[2]
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The white-headed stilt breeds in the spring, choosing as a nesting site an area of sand or shingle by an estuary, beside a dried up riverbed, on a flat bit of coast or in a grassy field near the sea. It seems particularly attracted to locations near where the red duck-weed (Azolla rubra) flourishes. The nest is found in a shallow depression or in a scrape in the ground where usually four, ovoido-conical eggs are laid. These are yellowish-brown dappled irregularly with dark blotches and spots. The nest is difficult to find as the eggs are well-camouflaged, but the parent birds give away the presence of the nest by mounting into the air and flying in circles, uttering distress cries. The chicks are able to leave the nest almost as soon as they have hatched. They are difficult to detect because their downy plumage is well-camouflaged and they "freeze" when alarmed. A parent bird sometimes feigns a leg injury to draw intruders away from its chicks.[2]
Status
The white-headed stilt has a wide range and large total population size and the population trend appears to be stable so the IUCN lists this bird as being of least concern.[1]
References
- 1 2 3 BirdLife International (2012). "Himantopus leucocephalus". IUCN Red List of Threatened Species. Version 2013.2. International Union for Conservation of Nature. Retrieved 2014-06-12.
- 1 2 3 4 Buller, Sir Walter Lawry (1888). A History of the Birds of New Zealand: Himantopus leucocephalus,. pp. 21–23.
- ↑ "White-headed Stilt · Himantopus leucocephalus Gould, 1837". Xeno-canto Foundation. Retrieved 2014-06-12.
- ↑ BirdLife International (2013). "Himantopus novaezelandiae". IUCN Red List of Threatened Species. Version 2013.2. International Union for Conservation of Nature. Retrieved 2014-06-13.
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