Mean atmospheric O2
Geologic Time Scale
Equid ungulates of the genus Eurohippus huddle in a forest 42 million years ago in what is today France.
An ancient ancestor to modern horses, donkeys, and zebras, Eurohippus was about the size of a small dog and possessed three toes instead of a single hoof. While modern equines are adapted to the varying and sometimes harsh climates of grasslands, Eurohippus lived and foraged in the relative comfort of warm and moist forests.
Copyright © Walter B. Myers. All rights reserved.
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