Animal Toxins is a collection of papers that tackles the advancement in studies that aim to enhance the contemporary understanding of animal toxins. The materials in the text are organized according to the organism they cover. The first section tackles the concerns with venomous arthropods, such as the structure of the venom gland of the black widow spider Latrodectus mactans and the biochemical-immunochemical aspects of the venom from the scorpion Centruroides sculpturatus. Next, articles about poisonous marine animals are presented, which include differentiation of the poisons of fish, shellfish, and plankton and block of sensory nerve conduction in the cat by mussel poison and tetrodotoxin. In Section III, the selection reviews papers about snakes and amphibians, such as epidemiological methods in studying venomous snakebites and chemistry of cytotoxic substances in amphibian toxins. The book will be of great interest to toxicologists, zoologists, and biochemists.