We have been feeding our BP adult mice for ages now even though he had outgrown them. We bought too many so he has just been getting 3-4 per meal. He is now about 3.5' long, no idea how much he weighs. I would like to switch him to rats but am not sure what size. I have to order online so there is no way to see them first. It looks like rat pups are roughly the equivalent of an adult mouse. So would rat weanlings be a good size to try? Or would I be better off going to a jumbo mouse?