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The bat will eventually get tired of flying around, so close the doors to keep it in one room and wait for it to land, keeping your eyes on it at all times. It will probably aim for a place where it can hang, such as behind curtains or upholstered furniture, on clothes that are hanging up, or even in house plants.  Stay quiet and still while you wait for the bat to land. This will help it calm down more quickly. Don't try to catch the bat in mid-air. It's almost impossible, and will only panic the bat more. The bat doesn't want to touch you, so stay calm if it accidentally bumps into you. It will flit away as soon as it can. Once the bat has landed, carefully and quietly place a plastic tub, bucket, or similar container over it. This will prevent the bat from flying away while you work to remove it.  Make sure the tub or bucket is large enough to comfortably fit the bat, so you don't accidentally injure it in the process. For best results, use a clear tub or bucket so you can see the bat as you trap and transport it. Work a piece of cardboard or stiff paper under the bucket to completely cover the opening. Keep the container as close to the wall or surface as possible, and be careful not to pinch the bat as you trap it inside. You can also use the lid of the bucket or tub (if it has one). To catch the bat with your hands, approach it slowly and quietly, then reach down and smoothly pick it up in both of your hands, keeping a firm but gentle hold on it.  Try to hold it so that its head is facing out, near the tips of your fingers, so you can keep the most pressure on its body. If the bat bites you, or if you get bat saliva in your eyes, nose, or mouth, seek medical attention immediately, since bats carry rabies. Quickly and carefully take the bucket outside to a nearby tree. Tilt it against the tree trunk and, holding the container at arms-length, carefully remove the cardboard to let the bat hop out.  If you used your hands, hold the bat up against the tree trunk at arms-length. Carefully loosen your grip and let it hop out onto the tree. Bats typically can't take flight from the ground, so releasing it onto a tree will help it to escape more easily. This is especially important for a bat that's stressed and fatigued from flying around your house. Check common bat entry points around your house, such as chimneys or openings that lead to attics or cellars. Seal them up as best you can, or hire a contractor to do so, to prevent another bat from getting into your house. Bats can enter or hide in any space that's big enough for 2 of your fingers.
Close the doors and wait until the bat lands if it's flying around. Place a tub or bucket over the bat. Slide a piece of cardboard over the top of the bucket to trap it. Scoop it up with your hands if you don't have a bucket. Take the bat outside and release it onto a tree. Seal up any potential entries once it's gone.