Abstract
Between 1932 and 1951, over 67,000 bats have been banded in North America (Mohr, 1952). This gives some idea as to the lack of data for any given species since there are some 36 species of bats found in the United States. The number of big brown bats banded has not been large. The literature based on these banding data contains some instructive information as well as some controversial points.

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