Horseshoe crabs look like living fossils. Did you know that their blood is blue? It’s the copper in it, that gives it that color.
Another strange thing: what looks like a small nose at the front of the shell, with dots that look like nostrils, is actually another set of light-sensing eyes.
Carbon dusk and pen and ink, on Duralar film.
Horseshoe crab: Limulus polyphemus