Stone-curlews, also known as Dikkops or Thick-knees are a group of largely tropical birds in the family Burhinidae. Despite the group being classified as waders, most species have a preference for arid or semi-arid habitats. They are found worldwide within the tropical zone, with some species also breeding in temperate Europe and Australia.
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 preference among authorities for one term or the other varying from year to year. The term Stone-curlew owes its origin to the broad similarities with true curlews, which are not closely related. 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 Thick-kneed Bustard.
They are largely nocturnal, particularly when singing their loud wailing songs, which are reminiscent of true curlews.

The following are some of the species.
Bush Stone-Curlew (Burhinus grallarius)
Double-striped Thick-knee (Burhinus bistriatus)
Peruvian Thick-knee (Burhinus superciliaris)
Senegal Thick-knee (Burhinus senegalensis)
Spotted Thick-knee, Cape Thick-knee (Burhinus capensis)
Eurasian Stone-curlew (Burhinus oedicnemus)
Water Thick-knee (Burhinus vermiculatus)