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Science and Nature
Overview

Why are There 30 Million Horseshoe Crabs on This Beach?

Overview is a nature series with an unexpected perspective. Breathtaking visuals zoom out to reveal Earth’s grand forces, then dive in to uncover hidden stories. Each episode is a journey of discovery, inviting viewers to see the planet more clearly and from a whole new point of view.

Why are There 30 Million Horseshoe Crabs on This Beach?

Season 1 Episode 18 | 8m 15s | CC

Every spring, the beaches of Delaware Bay play host to one of the world’s wildest parties. Millions of prehistoric crabs (and hundreds of thousands of birds) converge here. These horseshoe crabs spend most of their lives in the ocean depths. But every May and June, their spindly little legs will carry them 60 miles or more to congregate on sandy beaches up and down the Atlantic coast.

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