Measure evolution in your backyard!

The eastern gray squirrel (Sciurus carolinensis) consists of two color morphs: gray and black. Squirrels of different colors occur in very different patterns in different neighborhoods…why?


Image by Eyesplash Photography at Flickr (License: [CC BY-NC-ND](https://creativecommons.org/licenses/by-nc-nd/4.0/))

Image by Eyesplash Photography at Flickr (License: CC BY-NC-ND)