When a 4-foot-long king cobra appeared near a popular tourist area in southern Thailand, animal rescuers had their work cut out for them. One rescuer had to chase the venomous reptile into a sewer pipe and grab it by its tail. King cobras are the world's longest venomous snakes. Their bites affect the central nervous system and can lead to death within half an hour. The head of this cobra was the size of a fist, and the creature weighed over 30 pounds.