They might not be as ferocious as the sandworms from Dune, but hammerhead worms are nothing to sneeze at themselves. They’re toxic. They can carry parasites. They can grow to over a foot long.

The worms are part of a group of predatory species known as hammerhead flatworms, which grow to over a foot long. They prey on earthworms in the soil and produce a potent cocktail of chemicals to ...