The biggest disruption facing horseshoe crabs comes from humans

Horseshoe crabs survived mass extinction events that wiped out over 90% of life on Earth and killed off the dinosaurs,but

they're not invincible. And the biggest disruptions they've faced in millions of years come from us. Studies have shown that

up to 15% of horseshoe crabs die in the process of having their blood harvested. And recent research suggests this number may

be even higher.