I put together a rat colony (1.2) and put them in my rack. The rats do not bite but they are squirmy. What's the best way to move them for tub cleaning? I tried going under their bellies to lift, from the top under their front arms and eventually, and reluctantly, by the base of the tail. I'm hoping they get used to being moved but right now they don't want to be picked up.

I already have mice and ASF's and tails are fine with them. So what's the secret with big rats?

Thanks.