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| Index: > A B C D E F G H I J K L M N O P Q R S T U V W X Y Z |
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| Anseriformes | Whooper Swan |
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| Scientific classification | ||||||||
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| Families | ||||||||
| Anhimidae Anseranatidae Anatidae | ||||||||
The order Anseriformes contains about 150 species of bird in three families: the Anhimidae (the screamers), Anseranatidae (the Magpie Goose), and the Anatidae, which includes over 140 species of waterfowl, among them the ducks, geese, and swans.
All species in the order are highly adapted for an aquatic existence at the water surface. All are web-footed for efficient swimming (although some have subsequently become mainly terrestrial).
It is thought that the Anseriformes originated when two groups of specialised filter feeders diverged from the Charadriiformes (plovers, gulls and allies) by evolving different mechanisims to filter small food particles from water. The flamingos developed a filter structure in the lower part of the bill; the ancestors of the Anseriformes developed the characteristic bill structure that they still share. The combination of the internal shape of the bill and a modified tongue acts as a suction pump to draw water in at the tip of the bill and expel it from the sides and rear; an array of fine filter plates called lamellae traps small particles, which are then licked off and swallowed.
Bird family tree
All Anseriformes have this basic structure, but many have subsequently adopted alternative feeding strategies: geese graze on plants, the saw-billed ducksSea Ducks Smew (male : Animalia : Chordata : Aves : Anseriformes Family†: Anatidae Merginae Genera Polysticta Somateria Histrionicus Camptorhynchus Melanitta Clangula Bucephala Mergellus Lophodytes Mergus † For other ducks, see also: Anatida catch fish; even the screamerScreamers : Animalia : Chordata : Aves : Anseriformes Anhimidae Genera Anhima Chauna This article refers to the bird family. For the circus march, see Screamer''. The Screamers are a small family of birds, the Anhimidae. They are related to the ducks geess, which have bills that seem on first sight more like those of the game birds, still have vestigal lamellae.
The Anseriformes and the GalliformesMegapodidae Numididae Odontophoridae Phasianidae Meleagrididae Tetraonidae Cracidae Mesitornithidae The Galliformes is an order of birds containing the turkeys, grouse, quails and pheasants. About 256 species are found worldwide. These birds vary in size (pheasants etc) are ancestral to neognathous birds, and should follow ratiteStruthionidae Casuariidae Dinornithidae Apterygidae Rheidae A ratite is any of a diverse group of large, flightless birds of Gondwanian origin, most of them now extinct. All belong to the order Struthioniformes . Unlike other flightless birds, the ratitess and tinamouTinamou : Animalia : Chordata : Aves Tinamiformes Tinamidae Genera Tinamus ''Nothocercus ''Crypturellus ''Rhynchotus ''Nothoprocta ''Nothura ''Taoniscus ''Eudromia ''Tinamotis The Tinamous are one of the most ancient groups of bird, members of a South Ames in bird classification systems.
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