I actually have an adult corn snake who seems to be quite fastidious. She always goes outside of the cage. I learned to take her out and put her on a newspaper-covered plastic garbage bag. She goes right away (or not at all) then leaves the newspaper to slither over to me. She likes to climb on my arms and legs. If she has no choice but to go in her viv, it's always at the far end, cool side, and then I find her mashed up against the door, wanting to get out. I have a few dozen different species of snakes... she's the only one who does this.
i think I'm the one who's been trained!:rofl: