Blue Blood

Horseshoe crab blood contains hemocyanin (a molecule based on copper), which gives it a blue tinge.

Image Credit: FWC

FWC Facts:
The bowfin, or mudfish, is a ‘living fossil’ and is the only freshwater fish with a gular bone, a bony plate on the exterior of the lower jaw between the two jawbones.

Learn More at AskFWC