Leeches might seem like relics of a bygone age of medicine, but they haven’t outlived their usefulness to people yet. The freshwater leech Helobdella austinensis can eat its weight in snails every day ...

Snails aren’t too picky when it comes to their meals. They’ll eat pretty much whatever they can find, from plant matter to animal waste (and, in some cases, even other snails). Like learning about ...