The Diamondback Watersnake (classified by scientists as Nerodia rhombifer) one of the larger watersnakes, ranging from 40 to 65 inches in length. They are often light brown in color, though some may be greenish or olive. The distinctive yellowish diamond pattern on their scales gives them their name. Diamondback watersnakes will eat almost anything: frogs, insects, worms, fish, other snakes, and even small mammals. Their large, sharp teeth help to grab their prey, but many snakes will swallow the prey whole once it is caught.

This type of snake is often found on the banks of swamps and ponds. It may climb onto nearby branches or hide in marshy shrubs. Although they will bite if threatened, diamondback watersnakes are not poisonous. They spend the winters underground, coming to the surface in mid-April. Like many other reptiles, they lay eggs and hatch their young.

Diamondback watersnakes are endangered in many areas. It is illegal to capture or kill one of them, and efforts are being made to preserve Diamondback habitats and territory.