hey, rats aren't nasty(mine are even litter trained!)! Gerbils are bitey little devils on the other hand.
I don't think there is much of a benifit, you can't really go on "this is what they do in the wild" idea, because you would have to put them on soil, and throw in some nice ticks to
but if all you have access to is gerbils (and alot) then go ahead. But I have heard that bp's tend to get "addicted" to them. But I've never fed gerbils (well, not intentionaly
lol) so I really can't say that with expierence!