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How much bird is there, anyway?

10,000 Birds

He had the habit of asking very similar question about the animals featured in his zoology lectures, including basic questions like how big they are, what limits physiology puts on their geographic range, etc. For instance, among animals, booby and noddy combined probably represents the majority of the biomass of the somewhat unusual St.

Mammals 174
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What happened with Archaeopteryx?

10,000 Birds

Of those traits, there are two kinds: The ones that are bird-like, but are not shared between birds and other animals because of a common ancestor having had the trait. These animals were small, had highly efficient respiratory systems, were feather-clad, and may have soared around a bit. Flight is an example.

Mammals 246