The fact that the boa's head actually slammed into the glass leads me to believe it was a simple instance of cage aggression, which is common in even the friendliest of boas (which is why hook training is such a great thing!). If it was a defensive strike, the boa probably wouldn't have slammed into the glass.

However, the pet store's claim that this is a new and recurring behavior for this snake indicates that it is not cage aggression and is instead a reaction to stress, which is also very likely. Tell the pet store that boas NEED hides--and a cage cover or dark area is never a substitute for a snug hiding place!

Quote Originally Posted by SAMPSON-BP View Post
I'm curious cause it sounds like they'll buy some baby balls from me if the 2 new girls I'm getting lay, so I might ask to do a trade for him, but I'm worried about that if he stays this agressive...
If you want the boa, get it. Cage aggression disappears once the snake is out of the cage, and stress-induced defensiveness will also disappear with a few weeks without handling in a peaceful environment with suitable hiding areas. Boas are very sweet snakes, even if hatchlings can be a bit nippy every now and then. Any properly cared-for and handled boa will grow to be a very docile, sweet-tempered snake.

Quote Originally Posted by SpiffyYoshi View Post
There is no such thing as cage aggression, or aggression in general when it comes to snakes. The animal is either being defensive or has an aggressive feeding response...
Cage aggression is when a snake displays an aggressive feeding response when no food is present.