The stone-curlews, also known as dikkops or thick-knees, consist of 10 species within the family Burhinidae, and are found throughout the tropical and temperate parts of the world, with two or more species occurring in some areas of Africa, Asia, and Australia. Despite the group being classified as waders, most species have a preference for arid or semiarid habitats.

Taxonomy

The family Burhinidae was introduced in 1912 for the stone-curlews by Australian ornithologist Gregory Mathews. The family contains two genera: '' Burhinus'' and '' Esacus''. The name ''Burhinus'' combines the Ancient Greek ''bous'' meaning "ox" and ''rhis'', ''rhinos'' meaning "nose" (or "bill").

Molecular phylogenetic Molecular phylogenetics () is the branch of phylogeny that analyzes genetic, hereditary molecular differences, predominantly in DNA sequences, to gain information on an organism's evolutionary relationships. From these analyses, it is possible to ...

studies have shown that the family Burhinidae is sister to a

clade A clade (), also known as a monophyletic group or natural group, is a group of organisms that are monophyletic – that is, composed of a common ancestor and all its lineal descendants – on a phylogenetic tree. Rather than the English term, ...

containing the sheathbills in the family Chionidae and the

Magellanic plover The Magellanic plover (''Pluvianellus socialis'') is a rare wader found only in southernmost South America. Taxonomy It was long placed in with the other plovers in the family Charadriidae; however, behavioural evidence suggested they were disti ...

in its own family

Pluvianellidae The Magellanic plover (''Pluvianellus socialis'') is a rare wader found only in southernmost South America. Taxonomy It was long placed in with the other plovers in the family Charadriidae; however, behavioural evidence suggested they were disti ...

. The stone-curlews are not closely related to the

curlews The curlews () are a group of nine species of birds in the genus ''Numenius'', characterised by their long, slender, downcurved bills and mottled brown plumage. The English name is imitative of the Eurasian curlew's call, but may have been i ...

, genus '' Numenius'', that belong to the sandpiper family Scolopacidae.

Description

They are medium to large birds with strong black or yellow black bills, large yellow eyes—which give them a reptilian appearance—and cryptic plumage. The names thick-knee and stone-curlew are both in common use. The term stone-curlew owes its origin to the broad similarities with true curlews. Thick-knee refers to the prominent joints in the long yellow or greenish legs and apparently originated with a name coined in 1776 for ''B. oedicnemus'', the

Eurasian stone-curlew The Eurasian stone-curlew, Eurasian thick-knee, or simply stone-curlew (''Burhinus oedicnemus'') is a northern species of the Burhinidae (stone-curlew) bird family. Taxonomy The Eurasian stone-curlew was Species description, formally described ...

. Obviously the

heel The heel is the prominence at the posterior end of the foot. It is based on the projection of one bone, the calcaneus or heel bone, behind the articulation of the bones of the lower Human leg, leg. Structure To distribute the compressive for ...

( ankle) and the

knee In humans and other primates, the knee joins the thigh with the leg and consists of two joints: one between the femur and tibia (tibiofemoral joint), and one between the femur and patella (patellofemoral joint). It is the largest joint in the hu ...

are confused here.

Behaviour

They are largely nocturnal, particularly when singing their loud, wailing songs, which are reminiscent of true curlews. Their diet consists mainly of insects and other invertebrates. Larger species also take lizards and even small mammals. Most species are sedentary, but the Eurasian stone-curlew is a summer migrant in the temperate European part of its range, wintering in Africa.

Species

A fossil genus ''

Wilaru ''Wilaru'' is an extinct genus of bird of uncertain phylogenetic placement from the Late Oligocene to Early Miocene of Australia. It was originally classified as a stone-curlew, but subsequently it was argued to be a member of the extinct famil ...

'', described from the Late Oligocene to the Early Miocene of Australia, was originally classified as a stone-curlew, but was subsequently argued to be a member of the extinct anseriform family Presbyornithidae, instead. The living species are:

References

External links

Thick-knees videos
on the Internet Bird Collection {{DEFAULTSORT:Stone-Curlew Extant Cenozoic first appearances Taxa named by Gregory Mathews