Brazilian free-tailed bat

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The Brazilian free-tailed bat (Tadarida brasiliensis), also known as the Mexican free-tailed bat, is a member of the family of free-tailed bats with a tail that extends beyond the membranes between the feet. This small- to medium-sized gray bat has small, rounded ears is found from central North America, south to Brazil and other South American countries. This species can congregate in astoundingly-large aggregations. In Austin, Texas, this species roosts under Congress Avenue bridge and is the largest (1.5 million bats) urban-roosting colony of bats in the United States. In Colorado, there is a bachelor colony of Brazilian free-tailed bats at the Orient Mine in the San Luis Valley that numbers approximately 250,000 males.