You clamber up the tallest tree in your immediate area, climbing higher and higher until even the primates hesitate to advance. The branches are thin up here, little more than twigs, but you manage to reach the very pinnacle. Below you, monkeys are screaming, frightened to carry even their light frames any higher. That fear is well justified, as an unplanned trip down would almost certainly be fatal, and the limbs aren't exactly substantial. In fact, you just heard a crack...