The Eastern Pipistrelle bat, one of the smallest American bats, is another imperiled Indiana species that needs forests. Weighing less than 1/3 of an ounce and barely reaching 3 ½ inches in length, they can be mistaken for large moths. While they hibernate in winter in mines or caves, in summer they must find tree cavities or nest boxes such as the ones at Eagle Marsh to raise their young. These small reddish brown mammals hunt in or near their forest homes, near streams or over open water, making both Eagle Marsh and Arrowhead Marsh good places to call home. Eastern Pipistrelles fly in a floppy “butterfly” pattern and when hunting, can catch one insect every two seconds. Click here to learn more about these bats!