Hundreds of millions of years later, these species are nearly indistinguishable from their prehistoric ancestors. A horseshoe crab is seen swimming along the sea floor in coastal waters surrounding ...

A new study looking at horseshoe crabs in the Long Island Sound confirms the ancient creatures face potential extinction. The threat stems from climate change, loss of habitat, and overharvesting.

What do we owe horseshoe crabs? What do we owe horseshoe crabs? Horseshoe crab blood is key to making a COVID-19 vaccine—but the ecosystem may suffer. Horseshoe crab blood is key to making a COVID-19 ...

Mass Audubon's science coordinator Mark Faherty examines a horseshoe crab in Pleasant Bay, where he has conducted research on them for years. John Tlumacki/The Boston Globe via Getty Images If you ...

French photographer Laurent Ballesta has received this year's Wildlife Photographer of the Year award for his image of a tri-spine horseshoe crab off Pangatalan Island in the Philippines. When you ...

Supporters of the legislation argue it would protect a declining horseshoe crab population, while opponents warn it will harm the commercial fishing industry. By Jon Hurdle Conservationists are ...