Well my three year old Ball Python will NOT eat any rats, only mice. I have been feeding him once per week a jumbo mouse (about 33-45 g) for the last year. and now the jumbo mouse just doesn't seem big enough anymore, he swallows the thing in like 5 minutes easy.

I buy my rats and mice online from Big Cheese Rodents (http://www.bigcheeserodents.com) which are frozen. I then put them in a zip lock bag and submerge them in hot water for about an hour to thaw them out. I then feed them dead to him.

Well just recently I ordered 100 rats (small rats, about 50-89 g). I thawed it out, made sure it was warm and tried feeding him. As soon as he smelt the rat he just quickly moved his head away and went back into hiding, no attempt to eat at all. It was almost like he was afraid of the smell of the rat or something. I then thawed out a mouse, put it in there and he went wild and attacked it right away and ate it.

The next week I took a single mouse and a single rat, put them together in the same zip lock back, thawed them out together in hopes that the mouse smell would permeate the rat. Well I tried once again to feed him the rat first and he did the same thing, wouldn't even go near it. I then took the mouse out and before I could even get the mouse inside his cage he was already stuck up against the glass ready to attack. As soon as the mouse was in the cage he struck and ate it.

So what can I do to convert him to rats?

Thanks