Is this the only bat in the house? Big brown bat (Eptesicus fuscus) observed on Pier 8 during active work on the St. Croix River Crossing project, Aug. 4, 2016. MINNESOTA PROFILE ig Brown Bat (Eptdicusfuscus) Description. It is about 115 mm long as an adult, and the tail is a little over 40 mm. Bats are quite unique in the fact that unlike other mammals they fly. Big brown bat (Eptesicus fuscus) Eastern small-footed myotis (Myotis leibii) Gray bat (Myotis grisescens)*endangered; Little brown bat (Myotis lucifugus) The species of bat that hibernates in SE Michigan homes is the Big Brown Bat. Meet The Brown Bat The most common bats that we deal with here in Minnesota area the Little Brown Bat (Myotis lucifugus) and the Big Brown Bat (Eptesicus fuscus). The Big Brown has a wingspan of about 12 inches. The tooth formula is 2/3, 1/1, 2/3, 3/3. Their ears are small, rounded and black in color as are their wing membranes and tail. Minnesota’s Bat Species. These bats are red or brown colored and have a wingspan of 8-11 inches. Bats and bridges . No. Occasionally groups of these bats are still found living in tree cavities (Baker 1983). They are the Little Brown Bat, Eastern Pipistrelle, Northern Myotis, Big Brown Bat, Red Bat, Silver-haired Bat, and Hoary Bat.The most common bat to enter buildings is the Big Brown Bat and Little Brown Bat.The Minnesota bat problem is just as prevalent as other states. The Big Brown Bat is 4–5″ in length, has a wingspan of 11–13″ and weighs less than one ounce. Range / Habitat Found from Alaska into the lower 48 states, but few records from southern states despite records from Mexico. They have brown to glossy copper-colored fur on their back with the belly fur being lighter. There are about 18 types of bat species in Minnesota including the Little Brown Bat, Big Brown Bat, Red Bat, Big Free-Tailed Bat, Hoary Bat, Spotted Bat, Brazilian Free-Tailed Bat, and Silver Haired Bat are among a few. The big brown bat inhabits cities, towns, and rural areas, but is least commonly found in heavily forested regions (Kurta 1995). Winter Bat flying Activity - Do Bats Hibernate? The big brown bat is the only common large bat in Minnesota. but smaller than the big brown bat (Eptesicus fuscus). An adult is about 5 inches from nose to tail and has a wingspan of about 10 inches. Bats use a variety of habitats for day and night-time roosts, including trees, caves, and man-made structures such as bridges and buildings. Recently, some were found hibernating in caves in Minnesota (Knowles 1992). The following tags are used to highlight each species' conservation status as assessed by the International Union for Conservation of Nature; those on the left are used here, those in the second column in some other articles: Minnesota has 7 different species of bats.. It also shows their status in the wild.