Snakes are carnivorous reptiles in the suborder Serpentes that can be distinguished from legless lizards by their lack of eyelids and external ears. Like all squamates, snakes are ectothermic, amniote vertebrates covered in overlapping scales. Many species of snakes have skulls with many more joints than their lizard ancestors, enabling them to swallow prey much larger than their heads with their highly mobile jaws.

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To accommodate their narrow bodies, snakes’ paired organs (such as kidneys) appear one in front of the other instead of side by side, and most have only one functional lung. Some species retain a pelvic girdle with a pair of vestigial claws on either side of the cloaca.

Snakes are carnivores and they will hunt for food. They may also scavenge for food. Snakes that are top-level predators will hunt prey such as rabbits, rats, birds, frogs, and lizards. Snakes are opportunistic hunters; which means they will catch whatever is available. They can be seen hunting for food at night when the temperature cools down. At this time snakes will hunt for the smaller creatures. During the day the snakes can be seen resting in a cool place to digest their meal.

Snakes use their sense of smell to find food and also to find mates. Some snakes have special heat-sensing pits on their heads that help them track warm-blooded prey. The heat from the prey’s body helps guide the snake to its meal or mate. In order to kill its prey some snakes will constrict it while others inject venom into the animal which kills it instantly. Some species of snakes may strike out at prey using their fangs to inject venom into their prey.
Snakes can’t breathe underwater. They often hunt by lying in wait near the bank of a stream or river, then ambush fish and frogs that come to the surface.