I like feeding the snakes the most. It's just amazing that something with no arms, legs or venom (in some cases) can kill and eat something whole. It's like the Discovery channel without commericals.
The cleaning up after them is a close second. I have 4 dogs (2 Akita's, 1 Beagle, 1 Beagle mix) and yard clean up is a job and a half. Not to mention when a snake sheds it doesn't end up all over the house.
The whole waiting for Christmas effect when waiting for eggs to hatch is cool too.
