Hoary bats are found from northern Canada all the way to Guatemala, and also in South America and Hawaii. They are solitary and roost in trees. Their frosted, or hoary, look comes from a tinge of white over their grayish-brown fur. Their flight is distinctively fast and direct and can be used as an identifying trait. Hoary bats eat moths, beetles, grasshoppers, wasps, and dragonflies.

Adaptation: Crested, pointy-cusped cheek teeth are an adaptation to insect eating, as in the hoary bat, Lasiurus cinereus. The cutting surfaces are arranged like triangles, in a zigzag, which is an efficient way to pack a long, linear shearing edge into a small space.

Links:
Mammal Species of the World
Click here for The American Society of Mammalogists species account