The American Pit Viper is a venomous snake found in the United States. It is also known as the COPPERHEAD (10 letters) and RATTLESNAKE (11 letters). It is a member of the Crotalinae subfamily, which includes all pit vipers. It is a large, heavy-bodied snake with a triangular head and a rattle at the end of its tail. Its coloration varies from shades of brown to gray, and it has a distinctive pattern of dark crossbands on its back. It is an ambush predator, and its venom is highly toxic, making it a dangerous animal to encounter in the wild.