Opossums that are not injured and are over 7 inches long (excluding the tail) are old enough to be on their own and should be left alone. If the young opossum is under 7 inches and all alone, please call the wildlife rehabilitator closest to you. If you find a mother opossum that is dead or hit by a car, check her pouch for infants. Any pouch infants will need help. Do not try to remove them from the pouch. Please contact the wildlife rehabilitator closest to you.