Photograph: Florilegius/Alamy
Every day in bright clinical rooms in countries all over the world, horseshoe crabs are strapped into specially designed harnesses and drained of a third of their blood by people in lab coats. Then they are put back into rivers and oceans to swim-scuttle out their days.
Horseshoe crabs are prehistoric and they look it: a fossilised Roomba most of the way through eating a stingray. The horseshoe crab looks mainly like it should not be alive right now.
