For the little brown bat—a small mouse-eared bat with glossy brown fur—a warm, dry place to roost is essential to the species’ survival. Reproductive females huddle their small furry bodies together to save thermal energy during maternity season (summer), forming “maternity colonies.” In the face of severe population losses across North America, summer access to an attic or other permanent sheltered structure, as opposed to just trees or rock crevices, is a huge benefit to these bats.
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Source: Phys.org