Hemotoxins are frequently employed by venomous animals, including snakes (vipers and pit vipers) and spiders (brown recluse). Animal venoms contain enzymes and other proteins that are hemotoxic or neurotoxic or occasionally both (as in the Mojave rattlesnake, the Japanese mamushi,[1] and similar species). In addition to killing the prey, part of the function of a hemotoxic venom for some animals is to aid digestion.