In the classic 60s rock song, For What It's Worth, the Buffalo Springfield note, "Somethin's happening here, what it is ain't exactly clear." It was true half a century ago, and it's true in this image of what I thought was the nursery of an Eastern Tent Caterpillar. Their silk nests, which are most often found in the crotches of wild cherry trees, shelter dozens of ETCs, and as they get older, they leave en masse every night and stream out along branches to find fresh leaves. Typically, they return "home" during the day and hang out with each other. The caterpillars are locally very destructive, but I typically leave them alone, since Blue-Gray Gnatcatchers, Tufted Titmice, and other birds eat the insects and knock down their numbers. The crawlers are, at the very least, handsome "models," but today, when I was taking macro shots with the 85mm lens, I noticed something inexplicable: the ETCs were sharing the nest with a close relative, the Forest Tent Caterpillar, which actually doesn't make nests. What they're doing together is, well, somethin', but what ain't exactly clear.