I just become amazed as to how much terrible advice is on the internet and at pet stores (and even so called experts who breed them)....and the question of feeding inside or outside the cage is one that I feel has only one right answer....INSIDE. When it comes to keeping big snakes, there are certain absolutes once must follow and this is one of them. There are many, many, MANY reasons to feed inside the cage but here are just a few important considerations (and we are talking about full grown adult burms; sure, you can get away with feeding outside the cage for small burms under 10', but not with 15' animals):
1) stress: feeding outside the cage puts a huge and unnecessary stressor on a burm who may have just take a large meal. Once done, the last thing a large burm wants to do is to be moved around. This has been known to even cause regurgitation. Have you ever seen a 12' lb rabbit puked up...it is one of the stinkiest odors known to mankind.
2) safety: think about the idiotic logic of feeding a burm outside of its cage. You put the burm in a separate container/cage/whatever (even at that moment, you risk danger because the odor of food will be in the air). You feed it a large meal. It eats. There could be the odor of rabbit/etc still waffing in the air (or worse, on the keeper). The burm could still be hungry and it it smells rabbit nearby and sees human movement, well, put one and one together. Not only do you greatly increase your chances of taking a nasty bite, but in the form of a stupid feeding error, you take an even great chance of being killed (at that point, the burm isn't striking in a defensive manner, it is striking to grab hold and constrict)....and there are documented cases of this happening. Additionally, once that burm has fed in another cage, it may not want to be messed with. Have you tried moving a 16' burm that doesn't want to be moved?...good luck.
3) Last, I have been keeping burms for over 20 years (as a professional), in all of those years, I have NEVER been bit as a result of a burm mistaking me for food when I open the door. BUT, you need to take precautions. You don't just open a cage door and reach in and grab a snake....then you are asking for disaster. Instead, I have pull tabs on the sliding glass doors. I typically have some sort of shield device that keeps me between the snake and myself (even a hook will work). A resting snake doesn't always know that you are right there...you never want to startle a big snake! Instead, I use a hook to gently stroke the burm so it knows that I am there. I use a hook to keep the snake's head away from me so that I can gently lift the snake at midbody to coax it out of the cage. Or, if I am simply changing the water, I use a shield...once again, to provent a SFE.
Come feeding time, I ALWAYS offer frozen/thawed prey (usually rabbits) via LONG and sturdy tongs. Feeding inside the cage is FAR better and really the only responsible way in my opinion.
But, someone will try to prove me wrong and I will only say this....YOU WON'T CONVINCE ME.
Cheers,
Rob Carmichael