Corn Snake
The Corn Snake, also known as the Red Rat Snake, is an animal that can be found in GTA 6.
Corn Snakes are native to Leonida, and are easy to spot, thanks to their bright orange or brownish-yellow coloring. They live in a variety of habitats, including forests, agricultural lands, and suburban areas.
These non-venomous snakes are excellent climbers, and are known to enter homes in search of prey, such as rodents.
In Trailer 2, it is revealed that 
At 1:28 in the trailer, a vivarium can be seen in 
Therefore, it is possible that GTA 6 is adding the ability for players to keep pets - or else this specific snake may simply be added to the protagonists' home somewhere in the story.
