Snake venom, for example, is a type of TOXIN. It is a poisonous substance produced by certain animals, such as snakes, spiders, and scorpions, that can cause serious harm or even death to humans and other animals. Snake venom is composed of a complex mixture of proteins, enzymes, and other chemicals that can cause tissue damage, paralysis, and even death. The effects of snake venom vary depending on the species of snake and the amount of venom injected.