Double-striped thick-knee

From Wikipedia, the free encyclopedia
  (Redirected from Double-striped Thick-knee)
Jump to: navigation, search
Double-striped thick-knee
Double-striped Thick-knee.jpg
At the Milwaukee County Zoological Gardens
Conservation status
Scientific classification
Kingdom: Animalia
Phylum: Chordata
Class: Aves
Order: Charadriiformes
Family: Burhinidae
Genus: Burhinus
Species: B. bistriatus
Binomial name
Burhinus bistriatus
Wagler, 1829

The double-striped thick-knee (Burhinus bistriatus) is a stone-curlew, a group of waders in the family Burhinidae.

It is a resident breeder in Central and South America from southern Mexico south to Colombia, Venezuela and northern Brazil. It also occurs on Hispaniola and some of the Venezuelan islands, and is a very rare vagrant to Trinidad, Curaçao and the USA.

This is a largely nocturnal and crepuscular species of arid grassland, savanna, and other dry, open habitats. The nest is a bare scrape into which two olive-brown eggs are laid and incubated by both adults for 25–27 days to hatching. The downy young are precocial and soon leave the nest.

The double-striped thick-knee is a medium-large wader with a strong black and yellow bill, large yellow eyes, which give it a reptilian appearance, and cryptic plumage. The scientific genus name refers to the prominent joints in the long greenish-grey legs, and bistriatus to the two stripes of the head pattern.

The adult is about 46–50 cm long and weighs about 780-785 g. It has finely streaked grey-brown upperparts, and a paler brown neck and breast merging into the white belly. The head has a strong white supercilium bordered above by a black stripe. Juveniles are similar to adults, but have slightly darker brown upperparts and a whitish nape.

Double-striped thick-knee is striking in flight, with a white patch on the dark upperwing, and a white underwing with a black rear edge. However, it avoids flying, relying on crouching and camouflage for concealment. The song, given at night, is a loud kee-kee-kee.

There are four subspecies, differing in size and plumage tone, but individual variation makes identification of races difficult.

The double-striped thick-knee eats large insects and other small vertebrate and invertebrate prey. It is sometimes semi-domesticated because of its useful function in controlling insects, and has benefited from the clearing of woodlands to create pasture.

References[edit]

External links[edit]