But here we can see lined shrimps underneath the horseshoe crab’s carapace. These shrimp sometimes act as cleaners for fish, removing parasites. The horseshoe crab’s carapace is also playing host to ...

Horseshoe crab blood harvests have virtually doubled since 2017, with nearly 1 million horseshoe crabs harvested for their blood in 2022. Synthetic alternatives to horseshoe crab blood tests are ...