Actually you'd be surprised how many don't. We've gotten quite a few requests for snakes (and guns) as props, mainly because of the pictures my husband has posted of our stuff.
The only reason the photographers are willing to deal with us is we run everything under our regular business, with insurance, signed releases, etc. They're nervous about using animals from a private person, and it'll be a no-go for the OP since he's 16 so legally he can't even be held to a contract.