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Time since the end of the Precambrian supereon, explosion of life forms (541 million y) is 20 thousand x Time since first domestication of dogs (27,000 y)
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Estimated world population of Brown Hyena (8,000 individuals)
If this was a standard unit ...
"This is a fun and riveting book. Written in an accessible and engaging way, it is unputdownable." Frost Magazine
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