Bats can survive hibernation only in places providing constant low ambient temperature and high humidity to compensate for water losses through evaporation and safety from predation and disturbance. Bats are also sensitive in their roosting places. There are two common examples of roost types used by them. Tree holes are exposed to considerable variations in temperature and humidity, while caves provide a more stable environment and are thus important hibernation sites for many bat species. As a consequence, temperature tree bats more frequently show long-distance migration to cope with seasonal changes, while cave-dwelling bats rely on hibernation.

Bat House

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andrzej blonski | architects