Crawlspaces and attics can contain potentially dangerous animals and insects. Animals like rats, bats and even raccoons can be found in these spaces. They can become aggressive and cause serious injury or disease. Venomous insects may also be present and can potentially cause injury, though they are less common. The attic and crawlspace should be entered carefully at first, and adequate lighting should always be used in these spaces. If rodents or an insect infestation is discovered in the home, a professional pest control company should be used for removal. If bitten or harmed by a wild animal, seek medical attention immediately.