that may be true but my rats supply just startedto breed and I have 21 snakes( over half are rescues ) and the boa will eat 3 larg rats if I let her. I have some semi medium rat ( between small and medium ) but they old ( been frozen for over 6months so I am not too sure if they trustable. I just been using my ASF supply and using the ratI personally froze begining of the summer when I need more. ( dang litlte guys outgrew my supply and the frozen stuff either too smallor big lol.. )