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Name : Deni Puji Tri Utami
SRN : 2201408099
Subject : Paragraph-based writing
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Birds


Birds belong to a class of warm blooded vertebrate animals with feather covered bodies. Birds are the most important group of land-living vertebrate.
All birds have feathers, although in some types, particularly those that cannot fly, the normal structure of the feathers may be much modified and be downy, woolly, or straw like. The forelimbs of birds are modified the wings. The bony part of the tail, except in the very earliest fossil bird, is very short, and the visible tail is composed of feathers only. The teeth are absent except in some fossil forms. As in mammals, the only other group of warm blooded animal, the circulation is highly perfected so that there is no mixing of arteries by which this is accomplished, is different in the two groups. Birds have keen hearing, although they have no external ears. The sense of sight is also very keen, but the sense of smell is weak, except in a few vultures and other birds.



sources : onservation and
http://animals.nationalgeographic.com/animals/birds/