Tree squirrels are the Olympic divers of the rodent world, leaping gracefully among branches and structures high above the ground. And as with human divers, a squirrel's success in this competition ...

Two species – the eastern gray squirrel (Sciurus carolinensis) and the fox squirrel (Sciurus niger) – thrive on campus landscapes and are willing participants in our behavioral experiments.

GRAY SQUIRREL The gray squirrel, (Sciurus carolinensis) was introduced into the U.S. from Britain in the late 19th century.