Definitely something to keep in mind. While I had my booth at the earth fair, I made a point to put snakes back in their enclosures at certain times, with a hide provided, to give them some down time and prevent stress and possible bites. The kids kept wanting to hold them, but accepted my answer of, "They need to take a nap right now." I also kept a close eye on all animals being handled, watching for even the smallest signs of stress or fear, so I could intervene if necessary and keep the animals feeling safe and comfortable.