I dont think BPs are capable of this association. Retics are though. However I'd much rather have a retic that is "aggressive" in the cage then in some bucket in the middle of a room where it can freely move. Then you have to move this hyped up animal back to its cage after feeding. Feeding outside of the rack/cage is one major ingredient in the recipe of producing a SFE(stupid feeding error) and getting yourself killed if your working with animals that are capable of it.