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The sheathbills are a family of birds, Chionidae.Classified in the wader order Charadriiformes, the family consists of one genus, Chionis with two species. They breed on subantarctic islands and the Antarctic Peninsula, and the snowy sheathbill migrates to the Falkland Islands and coastal southern South America in the southern winter; they are the only bird family endemic as breeders to the ...
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The Palaeognathae or "old jaws" is one of the two superorders recognized within the taxonomic class Aves and consist of the ratites and tinamous.The ratites are mostly large and long-legged, flightless birds, lacking a keeled sternum.
Descriptions from life indicate the body and head were ash grey, and the white part of the tail had two dark central feathers. In contrast, stuffed specimens and old descriptions based on them indicate that the body was brown and the head bluish. This may be due to the specimens having changed colour as a result of ageing and exposure to light.
A = Anapsid, B = Synapsid, C = Diapsid. It was traditionally assumed that first reptiles were anapsids, having a solid skull with holes only for the nose, eyes, spinal cord, etc.; [10] the discoveries of synapsid-like openings in the skull roof of the skulls of several members of Parareptilia, including lanthanosuchoids, millerettids, bolosaurids, some nycteroleterids, some procolophonoids and ...
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