There are 9 species worldwide and 2 species which occur in Serbia. Order: CharadriiformesFamily: Burhinidae  The thick-knees are a group of largely tropical waders in the family Burhinidae. They are found worldwide within the tropical zone, with some species also breeding in temperate Europe and Australia. They are medium to large waders with strong black or yellow-black bills, large yellow eyes and cryptic plumage. Despite being classed as waders, most species have a preference for arid or semi-arid habitats. There are 9 species worldwide and 1 species which occurs in Serbia. Order: CharadriiformesFamily: Glareolidae  Glareolidae is a family of wading birds comprising the pratincoles, which have short legs, long pointed wings and long forked tails, and the coursers, which have long legs, short wings and long, pointed bills which curve downwards. There are 3 species which occur in Serbia. Order: CharadriiformesFamily: Charadriidae  The family Charadriidae includes the plovers, dotterels and lapwings. They are small to medium-sized birds with compact bodies, short, thick necks and long, usually pointed, wings. They are found in open country worldwide, mostly in habitats near water. There are 66 species worldwide and 8 species which occur in Serbia. Order: CharadriiformesFamily: Scolopacidae  Scolopacidae is a large diverse family of small to medium-sized shorebirds including the sandpipers, curlews, godwits, shanks, tattlers, woodcocks, snipes, dowitchers and phalaropes. The majority of these species eat small invertebrates picked out of the mud or soil. Variation in length of legs and bills enables multiple species to feed in the same habitat, particularly on the coast, without direct competition for food. There are 28 species which have been recorded in Serbia. Order: CharadriiformesFamily: Stercorariidae  The family Stercorariidae are, in general, medium to large birds, typically with grey or brown plumage, often with white markings on the wings. They nest on the ground in temperate and arctic regions and are long-distance migrants. There are 7 species worldwide and 3 species which occur in Serbia. Order: CharadriiformesFamily: Laridae  Laridae is a family of medium to large seabirds, the gulls, terns and skimmers.