Squirrel Mapper

Measuring evolution in action
in urban and rural landscapes.

Welcome to SquirrelMapper!

Life has evolved over millions of years. Yet evolution can produce dramatic change quickly! The coat color of gray squirrels, which occur over much of eastern North America and are introduced around the globe, is a good example. Today most are indeed gray but two centuries ago most were apparently black. How could evolution change this species so profoundly and so quickly?

pair of squirrels

Help us explore this question at SquirrelMapper where you can:

Together we can crack this nut!