My friend just bought a pretty large BCI female from a reptile show, not too long ago. She's about 7 feet long, and just took a large jumbo rat yesterday. Personally I see no reason to feed her anything larger at this time, but if she does decide to get a bit bigger then, maybe. I have heard that if they are just fed on rats, they will not grow extremely huge, but if guinea pigs and rabbits are used, they get larger (of course I am talking about bci, not bcc; those are freakin' monsters!)