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Horseshoe crabs are strange looking sea creatures.

They existed before the dinosaurs.

They've swum in our oceans for 450 million years.

Horseshoe crabs aren't from the crab family.

They're related to spiders and scorpions.

Since the 1970s, horseshoe crabs have helped medicine.

Their blood has a special chemical in it.

The chemical's used to test for harmful bacteria.

Bacteria on medical equipment is extremely dangerous.

So, this chemical's essential for safe operations and vaccines.

It's now used a lot more, says Glenn Gauvry.

Every year, about 500,000 horseshoe crabs have their blood taken for science.

Around 15 percent of these die in the process, and this isn't the only danger for these animals.

So it's very important to find a different chemical to replace horseshoe crab blood.

A Swiss biotech company's developing an alternative, but it's still in the development stage.

In the US, volunteers are watching and counting the horseshoe crabs in their natural habitat.

Laurel Sullivan thinks this is very special.

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