I think I'd get a no on chickens and pigeons, they tend to be assumed to be outdoor creatures and I'd get the same rigmarole as the ferret thing. A tortoise or iguana might get a yes. Fish definitely would, but I'm a little paranoid about knocking tanks over because I'm clumsy as heck, plus, as said above, you can't cuddle them. I do remember there's an exotics breeder not too far from me who has short-tailed opossums, which aren't herbivorous but, well, at least there's no specific rule against them, and they're tiny and silent. Ooh! Or maybe sugar gliders.