These small, mobile bits of lichen with formidable pinchers are quite common on the trees in the park near my house. They are apparently lacewing larvae, usually about 6-9 mm long, that have covered themselves bits of lichen.
If you pick one up, first, it curls up turning into a little ball of lichen. Then slowly, the ball begins to unroll briefly displaying the larva's belly and legs. Here is one upside down on the palm of my hand.
Finally, it executes a backward somersault and gets back on its legs.
I was seeing them back in July and I saw them again last weekend. Obviously, some of them survive the winter as larvae to mature in the spring.
It is said that the lichen camouflage offers protection against predators. Perhaps. I don't know how a larva attaches the lichen bits on its back. It would be interesting to watch one cover itself.