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Wader

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Waders
Dunlin Calidris alpina
A calidrid wader
Scientific classification
Kingdom: Animalia
Phylum: Chordata
Class: Aves
Order: Charadriiformes
Families
Charadridae
Jacanidae
Rostratulidae
Ibidorhynchidae
Recurvirostridae
Haematopodidae
Scolopacidae
Dromadidae
Burhinidae
Glareolidae
Thinocoridae

Waders, called Shorebirds in North America, are members of the Charadriiformes order of birds, but excluding the more marine seabird web-footed groups, these being the skuas (Stercoraracidae), gulls (Laridae), terns (Sternidae), skimmers (Rhynchopidae), sheathbill Chionididae and auks (Alcidae).

This leaves about 210 species most, but not all, of which are associated with wetland or coastal environments. Many species of Arctic and temperate regions are strongly migratory, but tropical birds are often resident, or move only in response to rainfall patterns. Some of the Arctic species, such Little Stint[?] are amongst the longest distance migrants, wintering in the southern hemisphere

The majority of species eat small invertebrates picked out of the mud or soil. Different lengths of bills enable different species to feed in the same habitat, particularly on the coast, without direct competition for food.

Some larger species, particularly those adapted to drier habitats will take larger prey including insects and small reptiles. The pratincoles are aerial insect eaters, hunting like swallows.

Many of the smaller species found in coastal habitats, particularly but not exclusively the calidrids, are often named as "Sandpipers", but this term does not have a strict meaning, since the Upland Sandpiper is a grassland species.

The following shows the groups of Charadriiform birds normally classed as waders. The approximate number of species is in brackets.

Charadriiformes

The large family Scolopacidae is often further subdivided into groups of similar birds. These groups do not necessarily consist of a single genus. The groups are

In the Sibley-Ahlquist taxonomy, waders and many other groups are subsumed into a greatly enlarged order Ciconiiformes.

See also list of birds



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