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migratory North American bat found in wooded areas from Canada to Mexico. It is one of the vesper bats, family Vespertilionidae, and measures 13-14 cm (5-5.5 inches) long, including a 5-6-cm (2-2.5-inch) tail; weight is about 30 grams (1 ounce). Its thick fur is yellowish or reddish brown and is tipped, or frosted, with silver. A strong-flying, solitary insect eater, the hoary bat roosts in trees, where the colour of its fur blends with that of lichen-covered bark. A subspecies of L. cinereus is the only bat in the Hawaiian Islands.