What kind of snake is this?

At first glance, it looks like an earthworm. ..

This kind of snake is called Wilson snake (Indigo snake).

Indigo snake belongs to the family Serpentidae, and its scientific name is Drymarchon corais. Distributed from the southeastern United States to Brazil, it is the largest snake in North America and one of the longest snakes in the family Serpentidae. Feeding on small vertebrates (including poisonous snakes). The feeding method is to bite the upper and lower palates or roll up the body to death, without relying on the contraction of the body. Self-defense hisses, wags its tail, but does not attack. Being able to live in a hole with a sand turtle is often called a sand turtle snake. The number of this kind of snake is very small and it is listed as an endangered species. This snake has smooth scales and can reflect sunlight to form a rainbow color, which looks like deep purple. With the change of external light, the color of this snake will also change.