The little brown bat
Species: Myotis lucifugus
The little brown bat is a small, insectivorous bat that can often be found living within human-made structures. Little brown bats will roost in a variety of locations, including abandoned buildings, attics, caves, and trees. Little brown bats weigh under half an ounce on average, with a wingspan of 8-11 inches (20-28 cm).
Like many insectivorous bats, little brown bats use echolocation to locate pray and navigate their environment.
When foraging during the night, little brown bats can emit up to 20 calls per second to identify prey and other objects. As they come closer to their prey, they can emit up to 200 calls per second!
The little brown bat population is decreasing due to the fungal disease White-nose Syndrome or WNS (Pseudogymnoascus destructans)
Conservation Status: Under Review
The little brown bat can be found from coast to coast across North America, from Mississippi to Alaska, and into Canada. They've also been found in higher elevations within Mexico.
During the summer, maternity colonies will roost in abandoned buildings, attics, behind peeling tree bark. In the winter, little brown bats go into a state of torpor, usually resting in caves or mines.