PB - Horseshoe crabs

Far from the medical labs and test tubes, a fisherman in old rubber boots walks across the docks of West Ocean City to inspect his catch.

He peers in a crate of spiny tails and grasping claws, hundreds of a common yet precious creature, among the oldest species on Earth: horseshoe crabs.

The scene on the docks is a glimpse into a strange and guarded Maryland fishery, one supporting a multimillion-dollar industry as surprising as the catch itself — a seemingly alien creature with 10 eyes, 12 legs and magical, milky blue blood.