First off, most "aggression" in snakes is really defensive behavior: snakes are shy & don't rely on vision to identify things, for the most part.
So when you walk by, your snake perceives "A big scary potential predator is out there, OMG!" They rely on our scent & touch to recognize us.
Your snake may be afraid, hungry or actually uncomfortable...a snake with pain or internal parasites may "act aggressive" too. So please, if you
get all the husbandry corrected (right temps & humidity, privacy, adequate food, etc) and he's still acting this way, a vet visit might be in order,
along with a fresh stool sample. It's possible that he got injured during his escape...I've never broken a rib but I'm willing to believe that it hurts
just as much whether you're a snake or a human?
And you mentioned he is now 11 years old: do you know much about his history, before you got him? If he was mishandled prior to your owner-
ship, he could have internal injuries or bad memories with humans, at the very least? That you initially allowed his cage temperatures to be too
cold would have lowered his immune function & could have allowed health issues to take hold. When an animal is in pain, they don't always
correctly blame the source...again, they get defensive.
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