Mean atmospheric O2
Geologic Time Scale
Eurohippus & horse compared
Mature Eurohippus 42 million years ago are compared to a modern adult horse (Equus ferus caballus). Eurohippus is only about 20 inches long and weighs just a few pounds*, while the modern horse is 6 feet tall at the shoulder and weighs 1,000 pounds.
* Values are estimates only based upon available paleontological data.
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