Monkeys.

As a kid, I lived out in the middle of no where. Well, that's certainly what it seemed like to me, we had hardly any neighbors and our road was dirt/gravel. (Now there's a major high way that runs right past it, but still hardly any houses). To entertain my self I climbed trees, lots of them. So, I guess it is no surprise to me that my kids are tree climbers. Mike made the comment "Never really thought of that tree as a climber...."

You can climb anything with branches.