Give Distinguish characles's of class Aves ?
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They are found worldwide from the deep Arctic to the deep Antarctic and all stations in between. The fact they can fly in and fly out again means that they are able to make short visits to many places to take advantage of seasonal food supplies in a way that other animals can't. They are able to make use of what otherwise would be very harsh environments by visiting in the better months only.
Birds are the most recently evolved of the vertebrate classes, with the oldest fossils going back about 160 million years. They are considered to be the modern descendants of the dinosaurs, being the only direct evolutionary line that survived the extinction event that wiped out all the other dinosaurs about 65 million years ago.
Birds are the most recently evolved of the vertebrate classes, with the oldest fossils going back about 160 million years. They are considered to be the modern descendants of the dinosaurs, being the only direct evolutionary line that survived the extinction event that wiped out all the other dinosaurs about 65 million years ago.
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