First, if your friend's asshole is loose enough for a snake to crawl up it (they're not going to put that much effort into it either, so you better think like...coke can loose) your friend has bigger issues than the snake.
Snakes are generally more wary of humans than we are of them.
Snakes also usually prefer live prey to dead ones, so the hamster thing doesn't surprise me. The silent member "TheHandThatMarksYourDoor" has been my best friend for 20 years and has had a ball python for a pet for about half that time. It's always fun to feed her live mice, as long as you're not squeamish. The way snakes unhinge their jaw to swallow prey can be quite cool to watch.
Snakes are generally more wary of humans than we are of them.
Snakes also usually prefer live prey to dead ones, so the hamster thing doesn't surprise me. The silent member "TheHandThatMarksYourDoor" has been my best friend for 20 years and has had a ball python for a pet for about half that time. It's always fun to feed her live mice, as long as you're not squeamish. The way snakes unhinge their jaw to swallow prey can be quite cool to watch.