1001 Space Earth Nature Evolution Fossils and Prehistoric Life Dinosaurs Simple Animals Insects and Spiders Fish Amphibians Reptiles Birds Sea Mammals Land Mammals Plant Kingdom How Plants Live Unusual Plants Ecology Conservation Animal Behaviour Pets and Farm Animals History Human World Science and Technology	Are all snakes poisonous? Many snakes are harmless to humans and do not have poison fangs. Some big snakes, such as pythons, kill their prey by squeezing it until it suffocates. A python   Previous: Back Book: 1001 Section: Nature Chapter: Reptiles