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 ...

Schistosomiasis is a debilitating disease caused by a parasitic worm that develops in freshwater snails before infecting people. Knocking back snail populations with pesticides is one method to ...