It varies depending on the snake from what I have learned. Elizabeth my normal....no smell what so ever. Henry....a little bit but nothing bad at all. Then there is Samantha the new butter....Holy Mother Of God.....it could kill you. She is in my bedroom...and she can pee in the middle of the night and it will wake you up instantly. I always have to get up and clean out the spot in her cage. Doesn't matter if it is 3 am....gotta happen right then. She is a stinker girl.