To me, renting a home is totally different from an apartment where your neighbor is on 2-3 sides of you (walls, ceiling, floor). Everybody can so easily be impacted from what each other do.

For a house, if pets are ok, that's good enough as long as you are not violating any ordinances. It's none of the landlord's business.

If your snakes or feeders get loose, chances are very low that they will come into contact with neighbors. Also the landlord does not have to answer to neighbors like s/he would if it was an apartment or duplex.

I would not feel guilty keeping quiet about the snakes and rats as long as pets are ok.