“Living Fossil” by Ben Nadler

Shy and his cousin Adam stood thigh-deep in Jamaica Bay, grabbing horseshoe crabs by their long tails and throwing them into the boat. Shy tossed them gently; Adam swung them down hard. The moon was round and bright like a police searchlight, which scared Shy, but Adam had explained that horseshoe crabs came up on the shore to spawn during summer full moons, and this was the time to make their score . . .