Animals on the Move

A warming climate means shifting ranges and mixed-up relationships for a lot of species

The American pika is second to only the polar bear as a symbol of a warming climate’s effects on animals. As their habitats have changed, pikas have hightailed it upslope.

© Sumio Harada/Minden Pictures/Corbis

Fuzzy, bright-eyed and no bigger than a baked potato, the American pika is the kind of critter you could imagine starring in a blockbuster animated movie for kids.