Mean atmospheric O2
Geologic Time Scale
Brontotherium with birds
Odd-toed ungulate mammals of the genus Brontotherium (AKA Megacerops) wander the lush Late Eocene landscape of South Dakota 35 million years ago.
Modern rhinoceroses have a symbiotic relationship with birds (variously known as oxpeckers or tick birds) that eat parasites they find on the rhino's skin and noisily warn of danger. No doubt similar symbiotic relationships existed between birds and the megafauna of the Eocene.
Copyright © Walter B. Myers. All rights reserved.
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