I used to think that feeding the snakes in their living enclosures made them more aggressive for handling. As some of the others said, I used to feed my BP's in feed containers when I had 5 or 6 animals. Now with a collection consisting of nearly 80 snakes (with all the new hatchlings) it would be nearly impossible to do so. I feed everyone right where they live. I haven't seen any increase in aggression in doing so either. I think its much more efficient and less stressful on the animals all together. I don't have many refusals when it comes to eating. I fed my animals the other day and out of nearly 80+ BP's only 2 didn't eat. One of which was in shed.