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It was first described as a species in 1796. Compared to other microbats, the big brown bat is relatively large, weighing 15–26 g (0.53–0.92 oz) and possessing a wingspan of 32.5–35 cm (12.8–13.8 in). Big brown bats are insectivorous, consuming a diverse array of insects, particularly night-flying insects, but especially beetles. [4]
Little brown bat during winter hibernation. In fall through spring, the little brown bat enters torpor, a state of decreased physiological activity, daily. Torpor saves energy for the bat when ambient temperatures are below 39 °F (4 °C) throughout the year and 32 °F (0 °C) in the winter; instead of expending energy to maintain a constant ...
Rabid bats usually lose their ability to fly, and rarely become aggressive. [49] Careless handling of bats is the main cause of rabies transmission. Since 2000, all the five human rabies cases contracted domestically in Canada were acquired from bats. [50] Fewer than 2% of bats in Canada are rabid, 95% of which are big brown bats.
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In 2020, the big brown bat was designated the official state mammal of the District of Columbia. [4] In 2023, a successful campaign was launched to make the pallid bat the state bat of California. [5] The bill passed both houses unanimously and will take effect on January 1, 2024. [6]
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Common noctule bats hibernate in winter, and sometimes congregate in hibernation colonies of up to 1000 individuals. In late summer the adult females migrate back southwards to the wintering areas, the young following later. Hibernation at these latitudes is thought to avoid too many days in winter below 0 °C (32 °F). [19]
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