One reason to make them happy: a single 3 1/2-inch-long little brown bat, the most common kind, can eat 600 mosquitoes in an hour.

A single little brown bat can catch 600 mosquitoes an hour.

Little brown bats and red fox can be seen at night.

Conversely, brown bats average close to 20 hours a day.

Big brown bats are known also to produce audible sound during flight.

For instance, the little brown bat, half the size of a mouse, can live 30 years in the wild.

Some brown bats will fly hundreds of miles to return to where they were born.

The little brown bat is found throughout much of North America.

The average sleep time of a little brown bat in captivity is said to be 19.9 hours per day.

First the police came, trapping the big brown bat, one of two species common in these parts.