How These Very Ancient Crabs Save Lives

These primitive arthropods have lived on earth for 360 million years, largely in the same form as they appear today.

Animals & Nature How These Very Ancient Crabs Save Lives Horseshoe crabs are often called living fossils. These primitive arthropods have lived on earth for 360 million years, largely in the same form as they appear today. Despite their long history, their existence is now threatened by human activities, including harvesting their blood for medical research. READ NOW Advertisement READ THESE Why Do Some Male and Female Animals Look So Different? Four Senses Animals Have That Humans Don't How a Tiny Bit of Sand Can Make a Pearl You are receiving this newsletter because you subscribed to the Today I Learned newsletter. If you wish to unsubscribe, please click here A Dotdash Brand 1500 Broadway, 6th Floor, New York, NY, 10036 © 2017 Dotdash - All rights reserved. Privacy Policy.