Most of us, I think, particularly guys, but a lot of girls too, climbed trees when we were children, at least if we lived in a place where there were climbable trees. When is the last time that you have climbed a tree? I set a camera up in a tree a few years ago but I cheated and used a ladder, so I didn't actually climb that tree. The last time I climbed a tree, I was in my late twenties or very early thirties, I think, and I was visiting Michigan with my son. He climbed a tree like it was something I wouldn't be able to do, so I did. In my forties and probably even in my fifties, I would have been physically capable of climbing trees, but I was in the Rio Grande Valley of Texas, where most of the trees - and most of the plants, for that matter - were weaponized with thorns and prickly things. Plus, the trees were small and I had no reason to climb them. Today, while I suppose there are trees on earth that I might be able to climb, I think it's safe to say that my tree-climbing days are over.