I get a kick out of seeing my snakes lounging on their branches, & they come up with new ways all the time, especially since I usually provide more than just 2 branches. Some kinds of snakes seem to feel safer when up in branches, or may prefer the vantage point to pounce on clueless prey below them. Then too, some snakes may also be after birds & eggs in the trees. And I think branches offer a work-out for their muscles & balance too- plus they make the most of the space available- like a second story in a human home.