usually from mid-September through march they may be slightly lighter, than in summer months. Argentine brown bats have distinctive; husky bodies, a large broad head, with short round ears. This species of bat differ from other species of the same family because their average body size is larger than E. diminutus but they are smaller than both E. basillensis and E. fuscus.
Argentine brown bats are typically found from mid-September through March, when they may be slightly lighter than in summer months.  They have distinctive husky bodies, large broad heads with short round ears. This species of bat differs from others in its family because their average body size is larger than E. diminutus but smaller than both E. basillensis and E. fuscus.