Cover of They Still Rule Earth. We Just Don't See Them.

They Still Rule Earth. We Just Don't See Them.

They Still Rule Earth. We Just Don't See Them.

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Summary
Birds are vertebrate animals constituting the class Aves, characterised by feathers, toothless beaked jaws, the laying of hard-shelled eggs, a high metabolic rate, a four-chambered heart, and a strong yet lightweight skeleton. They are warm-blooded, live worldwide, and range in size from the 5.5 cm (2.2 in) bee hummingbird to the 2.8 m (9 ft 2 in) common ostrich. There are over 11,000 living speci
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