Most bats feed on insects, which they capture while in flight. Like nightjars, bats use echolocation to pin-point insects in the air. Horseshoe Bats, for example, have flaps of skin on the nose. They use these to direct sounds which they fire out of their nostrils. They send out many pulses of sound each second and listen for any echoes.
Bats have very good hearing.
Their large, curved ears collect sounds from over a wide area. Bats that live in caves also use echolocation to find their way around in dark, cramped spaces. Their body temperature depends on their surroundings. Many reptiles that live in deserts are nocturnal. They avoid the heat and bright light of the day by burrowing or sleeping in the shade, and only come out when darkness falls.