Encounters with squirrels can be humbling. After watching one of them grip the beech tree with its hind legs and stretch its gray body to what seemed an abnormally long distance over to Sadie's birdfeeder, I decided it was time to move it farther out on the limb, beyond the point at which any normal being could reach. It didn't faze our squirrels at all. I came home and found two of them romping around on it, having walked along the slender limb and approached the feeder from above. I moved the feeder even farther out, right out to the delicate, flimsy part of the branch where I was afraid it would tumble from its own weight. No matter. The squirrels hazarded the springy, fragile branch and again got at the seeds, knocking the top askew.