Springtime Brown Bats:

In Springtime brown bats are born and live in nursery colonies that can house thousands of mother and baby bats. During birth, the mother bat hangs right-side up. She will give birth to only one pup.  Once born, the baby bat attaches to his mother to nurse. Baby brown bats will nurse for around two weeks. The baby bats can hear as well as other adult bats by the time they reach 13 days old. When only 3 weeks old, the baby bat has teeth and can now fly away to find his own food.

Adult Life

Adult brown bats live in one roosts during the light hours and a different roosts after dark. For a roost to attract bats, the air temperature needs to remain close to the same all the time. Day roosts usually have very little light while night roosts are more closed in so many bats can hang together for warmth. The animals hunt at night and prey on small insects, some eat up to 6000 a night! They capture their food with their teeth or sometimes use their tail and wings to catch bugs.


In late fall,  brown bats get ready to hibernate by finding a good roost in a cave or old structure. The first bats to arrive will swarm the roost area so other bats can find it. First will be adult male bats, they are then followed by the females. Brown bats usually hibernate between September and October, and wake around  April. The animals can sometimes wake every few weeks though and will fly around if the night is warm, but they won’t hunt or eat. They reserve fat to provide them with energy during hibernation.


Brown bats can usually live six to seven years, but some have survived past 10 years. The bats’ adaptability allows them to survive changing climates and landscape. The male bats generally live longer than females. Death comes to younger bats usually easier than adults due to size and fat storage. In addition, being disturbed during hibernation can sometimes cause mortality.

For all your bat removal needs contact us at Bat Specialists of Michigan 248-800-4126