If he's in California, that makes things even MORE difficult for the landlord! It's not easy to evict a tenant here, and I've heard of cases where people "squatted" for months before the landlord succeeded. So I'd fight this as long as possible, and read that lease very carefully again. If it doesn't exclude reptiles and/or give a maximum number allowed, they will have little grounds on which to evict... and at the very least, the OP can buy themselves some time to figure out their next move.