Little Brown Bat By: Samuel, Caleb, Raelynn The little brown bat has wings. He is 3 to 4 inches long and weighs no more than ½ ounce. He is brown. Bats eat a 1000 insects an hour. Sleeps and grooms during the day. They hunt at night. they hunt wasps and moths. A bat is a mammal that can truly fly and grows hair.