The big brown bat (Eptesicus fuscus) is found through out the entire continent of North America (includes Canada, Mexico, Central America) and also the Caribbean islands. The roosting habits of the big brown bat are similar to the little brown bat, again varying with the time of day and year. They will use both natural (tree cavities, caves, etc.,) and manmade structures. The big brown bat is thought by some to be much more of an urban dweller. (Kurta, 1995) and now may mostly prefer buildings for summer residence and periods of hibernation. The big brown bat will winter over in barns, churches, stadiums, and most importantly, homes. (Baker 1983) Big brown bats are also insectivores and they too will consume a good percentage of their body weight in insects (especially beetles) during peak summertime activity. This ravenous appetite allows bats to build up fat reserves before entering hibernation. Seasonal activity mirrors the little brown bat, but extends into late fall. The big brown bat is nearly twice the size (avg.) as little brown bat (up to 5 inches long with a wingspan over 13 inches) with similar coloring. Because the big brown bat does not really migrate much and seems to prefer buildings, many New Englanders are surprised when they learn their home is a winter (and possible year round) residence for big brown bats. During mild winter days, phantom noises in wall voids or attics are often attributed to mice, but in fact may be caused by bats temporarily waking from hibernation. If you suspect you are sharing your home with bats, please contact us for humane removal and expert bat proofing.
Big Brown Bat
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