Horseshoe crabs are awesome!
Bottom Dwellers
One of the most important bottom dwellers is the horseshoe crab. The horseshoe crab has been around for millions of years.
Did you know that the horseshoe crab has blue blood? They are the only animals that have a special substance in the blood that is used to test vaccines. It is so important because humans can’t make it.
The horseshoe crab is awesome!