Bats need no home during the lush summer nights when the air is full of edible insects. By day they hang in convenient rooststrees, chimneys or barns. But when the chill months come and insects disappear, torpor comes over them and with it a longing for their own cave, the same spot where they have spent previous winters. Bats sometimes fly 100 miles to find their old cave and sleep in it until spring.
Charles E. Mohr of Philadelphia's Academy of Natural Sciences reported in Frontiers last week on his ten-year study of the...
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