The pill beetle (Byrrhus pilula) is a stout, slow-moving insect with a truly remarkable line of defense. When threatened, it relies on a clever behavioral trick known as thanatosis: it pulls its legs and antennae tightly into specialized grooves on its underside and plays dead. In this state, its compact, convex body perfectly mimics a rabbit dropping or a small pebble, making it virtually invisible to passing predators. Both the adults and their subterranean larvae are specialized herbivores, feeding primarily on mosses, algae, liverworts, and the occasional grass root. I chanced upon this tiny, masterfully camouflaged pill beetle while exploring Ilha Deserta in Faro, Portugal. Finding such a specialized moss-feeder in the sun-baked, sandy environment of the Ria Formosa Natural Park was a wonderful surprise.