Big Brown Bat
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Eptesicus fuscus
Scientific name translation: "Flying", "Brown" |
Description
Big brown bats are relatively large-bodied (still small) compared to other bats in the state and have short, broad wings. E. fuscus have glossy, brown fur on their back and paler, lighter fur on their belly. Their head is large, nose is broad, lips are fleshy, tragus is short and blunt, and the keel is present on their calcar. Big brown bats have a head and body length that ranges from 64–75 mm, tail length that ranges from 42–52 mm, approximate ear length of 17 mm, and forearm length that ranges from 42–52 mm.
Distribution
This species is common across all habitats in South Dakota, including human-made structures. Though many people may never come across a bat, this species is the most likely bat to encounter.
Ecology
Big brown bats winter roosts are found in abandoned mines and caves, but will also regularly be found hibernating in man-made structures. Similar to most bats, this species is social and can be found as singles and/or in small groups or larger colonies. After emerging from their hibernacula in the spring, pups will be born in May–June. Mating will occur in the fall before returning to their hibernacula before winter. This species can live up to 20 years or more.
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