Meet the German hairy snail (Pseudotrichia rubiginosa): a tiny mollusk with a hairy shell that lives along the River Thames in England, among other places. The German hairy snail is one of the United Kingdom’s most endangered mollusks, with its original habitat along the river diminished to limited, disconnected areas. According to the fossil record, the German hairy snail has existed in the UK at least since the Stone Age and perhaps even since the last Ice Age. At the time, mainland Europe was still connected to Britain, and the Thames was connected to the German River Rhine. Getting a better picture about the distribution of this funky snail is important to its survival and could rally efforts to safeguard and restore London’s riverine habitats.