Interesting.
I wasn't actually sure what 'size' rats I had been feeding as the information just got lost in the deluge when I got Monty.
Looking at those pictures they look most like fuzzies (only bare) but on the larger end of things. I do remember the advice was to finish the bag of 10 then move up a size.
I am very tempted to see if he will tak two this Friday (I reckon so) but I will hold fire untill he poops for the first time!