Snake is a Western Diamondback Rattlesnake that appears in the credits. She is voiced by Kari Wahlgren, also the voice of Shellsea.
It looks like she is friends with an unnamed female mouse (but she simply calls her Mouse). She enjoys watching the fish in the tanks. Snake and Mouse always appeared in the end credits, usually talking about what the episode is about such as pets, adulthood, football, and humor.