They emit high-pitched sounds and listen for the echo from objects in their surroundings. All Colorado bats eat insects, and nearly all of them eat insects only. The pallid bat may forage on the ground and eat scorpions, centipedes and non-flying insects, however. The hoary bat eats smaller bats when opportunity allows. Some bats will eat almost any insect, but others are specialists.
Several species eat moths.
Often they awaken to feed again before dawn. Then they move to a suitable day roost to sleep. Many species live in caves, crevices, mines and tunnels. The big and little brown bats frequently roost in houses. Silver-haired bats roost behind loose tree bark.