I disagree with RetiredJedi and dont think bps are that smart that theyre able to think, hey if i bite or hiss he'll put me back. I win! Same way that the cage feeding aggression theory is a myth. That kinda response is the same so saying theyre not smart enough to do the one, but not the other, doesnt make sense. (Because we all know feeding in the cage causing aggression is a myth).

My snakes yawn all the time when i have them out. Its not a sign of aggression at all. Nothing to be worried about!