All have immobile eyes in large heads. Fluffy plumage makes their flight nearly soundless. Many species hunt at night and roost during the day.
Some species have conspicuous feather tufts.
Rodents, birds, reptiles, fish, large insects. To find an owl, search the ground for regurgitated pellets of fur and bone below a nest or roost. Listen for flocks of small songbirds noisily mobbing a roosting owl.