10 Animals That Bleed Blue

Turns out blue bloods are pretty gross even without the inbreeding. Without iron-rich hemoglobin turning their blood a recognizable red, these animals have had to make do with copper-based hemocyanin.

1. Cuttlefish

2. Pillbug (Roly-Poly)

4. Tarantula

6. Emperor Scorpion

9. Horseshoe Crab

BONUS! Two Animals With Green Blood

11. Marine Worms

12. Green Tree Skink

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