Frankly saying they're not pets nor are they tame or domesticated would just make your landlord even more inclined to evict you, because that logic you're saying you have wild animals in your apartment.
I'm sorry that you're looking at losing a large chunk of change, your animals, or the roof over your head, but on the other hand you chose to twist the rules. It's nice that your neighbors and maintenance people had no problems, but ultimately your landlord makes the choice as he owns the building. If you had mentioned to him up front or asked if you could pay a deposit before got the snakes, he probably would have been okay. So now as opposed to a $500 catch-all pet deposit, you're looking at $700 fine.
That's also incredibly unfair to your animals to put them in a situation where it was a matter of time before you were caught. It's your responsibility to wisely care for them, and an uncertain living arrangement does not meet that requirement.