There was an Eastern Tent Caterpillar just below the bat. That caterpillar had better watch out or he will be the bat's dinner.
Big brown bat, Eptesicus fuscus, recorded with an Echo Meter Touch on an iPhone. ID confirmed manually and with Kaleidoscope software. Note Tricolored bat in background.
The big brown bat (Eptesicus fuscus) is native to North America, Central America, the Caribbean, and extreme northern South America.