this is an often debated question but having kept and bred bp's for over 30 years (and currently have several that are in the 35 year old range) I firmly defend the stance that it is typically much better to feed INSIDE the cage. Bp's are very prone to stress related illnesses; this type of stress can lead to many healht problems including eventual death. The problem with stress related illnesses in bp's is that many owners don't recognize when their snake is stressed until it is too late. When you take a snake like a bp outside of its cage and into a "new" environment, that already puts the snake under some sort of stress; yes, the snake may feed, but it has experienced some stress that it didn't need to. Over time, this can have a delibitating effect on a snake. Instead, feed the snake inside its own cage by offering f/t rodents via tongs/hermostats. If you keep your snake on newspaper, there is nothing to worry about. If you use a wood mulch or some sort of particulate-type of bedding, then I would recommend laying a flat piece of paper over the bedding and then feed the snake on top of that. There is the argument that a snake that is fed inside its own cage is more prone to biting its owner...that's pure BOGUS you know what. As long as you use a hook to take a snake out of its cage, you will not be bitten; it is that simple. And if you don't use a hook for a bp (which is not a necessity), just train your bp that food only comes on one side of the cage via the same door and if you are going to handle the snake, use the other sliding door.
Feeding inside the cage becomes even more important when you are working with large constrictors and venomous species like I do. Hope this helps. Rob
Rob Carmichael, Curator
The Wildlife Discovery Center at Elawa Farm
City of Lake Forest Parks & Recreation (IL)