For snakes, it might not only be a deposit but insurance as well. Make sure you find a renters policy with a pet incident rider, in case that thing does crawl out and bite someone or eat another tenant's hamster. It happened to us in a building we use to manage that had 6 units and the python got out and ate the tenants cat. Needless to say after the distraught tenant called every single person she could to try and sue us, the owner, and the city for allowing it to be there, we had to pay $1000 restitution and from that point on, our owner banned ALL PETS. Its a building/owner by building/owner thing. Snakes are common, but always, protect yourself with incident insurance.