The Diverse White River fauna includes Archaeotherium, a 40-inch tall, pig-like animal (rear-left), Mesohippus bairdi (front-center), a 3-toed horse, and Poebrotherium (front-right), a 26-inch tall ancestral camel.

Bathornis, a seriema bird, attained heights of 25 inches. It is shown here eating Glyptosaurus, a small lizard.