Habitat Shift

National Parks Service

A change of habitat by a small mammal is having an impact on our mountain ecosystems, and the pika is being used to help understand high elevation mountain ecosystems. 

Background trees and tropical bushes. Small pond with two Hyrachyus, similar to tapir and rhino.
University of Utah

Millions of years ago there were diverse and large populations of mega-herbivores, but today there are only a few mega-herbivore species. New research reveals a new theory about the extinction of these ancient mega-herbivore species.