King cobras are nocturnal, and can be found in water and trees. King cobras weigh 13-18 pounds. They can have babies when they are about four years old. The king cobra's usual diet is snakes, even poisonous ones. They will also eat small lizards or other reptiles when they can't find any snakes. The king cobra lays about 40 eggs at a time.

Sources:
"King Cobra" Microsoft Encarta Encyclopedia 99
http://www.no-pest.com/KingCobra.htm