I'm thinking a small snake. Like a corn snake or king snake. Only thing they need is food, which you can buy in bulk, frozen, and thaw it out for them, change their water when they need it and give them a place to hide. Other than that, just make sure the temp is right in their tank and you should be good to go ^^. . I'm also in agreement with the person below me ^^ the only reason I didn't suggest them first is because you need to start with a ten gallon and work your way up to a big enough enclosure for life. It can get a little expensive in that area, but really, its worth it! They are very docile and wonderful pets.