Bat inspection in Fairfield, CT showed a lot of activity in the attic space of big and small brown bats, which are the most common bat in Connecticut. This attic had bats roosting in the gable vent areas which is also a common place for them to hang inside of the attic.
he Little Brown Bat and the Big Brown Bat have been the two most common bats in Connecticut. Both have brown-furred bodies. The forelegs and “hands” of bats have become wings. The wing membranes stretch between the elongated “fingers”. The “thumb” exists as a little claw at the end of the forearm. Bats use this claw to climb and crawl when not in flight. Bats roost by hanging upside-down from their rear foot claws.
The Little Brown Bat weighs 1/8 to 1/2 oz. The body is 2 to 4 inches long and the wingspan is 9 to 11 inches.
The Big Brown Bat weighs 1/2 oz or a little more. The body is 6 to 7 inches long and the wingspan is 12 to 16 inches.