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Birds are included in the Aves class and consist of approximately 9,000 species. Birds do not have teeth and only have their tail and feathers interesting, but these animals share similar features with different reptiles. For example, the presence of foot scales, hard beaks, and including ovipar animals that produce hard-shelled amniotic eggs.

Birds are the only modern animal that has feathers on most of its body. There are two types of feathers, ie flying feathers and down feathers or with other languages ​​declining. Feather down is useful to block the loss of body heat. This is important because birds include homoterm animals, animals that maintain constant and relatively high temperatures that remain active even in cold weather.