Emily Tripp, marine scientist and commentator, says:
SciShow‘s Hank Green is right: “Horseshoe crabs are super old, super cool, and they deserve your respect.”
Have you ever received a vaccine or drug through injection? You can thank horseshoe crabs for ensuring that injection was bacteria-free.
Horseshoe crabs have amazing blood with some unique properties. Not only is it blue, but their blood cells have a chemical that binds to and inactivates unwanted bacteria, viruses and fungi, by creating a gooey mass around the infective agents, which prevents them from spreading. This chemical is found only in horseshoe crab blood.
So how do we get a hold of that blood? The process, which involves piercing the tissue around the horseshoe crab’s heart and draining 30 percent of their blood, seems a little harsh, but it isn’t (usually) fatal.
Emily Tripp is the publisher and editor of MarineScienceToday.com, an online magazine about what's in, on, and around the oceans. She holds marine science and biology degrees from the University of Miami's Rosenstiel School of Marine and Atmospheric Science.