I saw a couple people write that cage aggro is a myth, thats just sillly. It maybe uncommon in BPs but to tell a new guy its a myth is bad, what if his next snake is not a ball. I have seen it in boas, and I have 2 balls that where feed in there cages before I got them, and they act differant when i open there lid, They dont strike but they have a differant look on there face, till I touch them they are in food mode, This is in fact cage aggersion, my balls always size it up before striking, where the boas and corns i have had in the past, shoot first and ask if they can swallow it after. The BPs tendecty check out there food before they strike IMHO is the reason that they have "no cage aggro". not that they arent in food mode when you open the cage.
chris