Bats are the only mammals that can actually fly. They are brown or black in color, and more active at night than during the day. Bats feast on insects; however, they can bite a human or animal if they feel threatened. Since bats can carry rabies, you will want to get rid of them if you find them in your attic. An exterminator will do the best job, but this is often too expensive an option for some. Another method involves the use of mothballs.
Put on a pair of gloves to protect your skin from touching the mothballs. Then put on a pair of goggles and a mask. The goggles will protect your eyes, while the mask will prevent you from breathing in any fumes from the mothballs.
Place 10 mothballs in a nylon stocking. Repeat this so that you have several bags of stockings filled with 10 mothballs each.
Hang the mothball bags all around your attic. Bats hate the smell, and they will not come back in the attic.
Take any leftover mothballs and shove them in any openings where you think the bats were coming in. This way, the bats will smell the mothballs before they even try to enter the attic.