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Credit: Josef P. Willems/Getty

Climate

Extreme Climate Change Millions of Years Ago Caused Mammals to Shrink

Significant dwarfing in mammals occurred about 53 million years ago due to dramatic shifts in climate, which resemble what could occur in the next century if humans don't reduce greenhouse gas emissions.

Published On 03/16/2017
9:33 AM EDT
Arenahippus jaw fragment (with second and third molars), as discovered in field. For scale, the tip of the chisel is about 1 centimeter wide. Credit: A. D'Ambrosia Carroll