There are about 50 species of flying squirrels ranging across most of North America down into Central America, and stretching from Southeast and Northern Asia into Siberia and Scandinavia.

To date, 122 flying squirrels have been trapped, 22 of each species collared. “It’s not as simple as they overlap or they don’t. There are a lot of different scales,” Joyce said.

With built-in parachutes in the form of wing-like flaps of skin stretching from leg to leg, West Virginia northern flying squirrels glide among the trees in the mountains of Appalachia. Flying ...

The smaller group arrived Feb. 8 and has been broken up ... flying squirrels are the smaller of two flying squirrel species that call Pennsylvania home. The other is the larger northern flying ...