Okay, this isn’t about breathing directly. But it’s too weird to skip. Lobster blood uses copper to carry oxygen, not iron like ours. Copper turns blue when oxygenated. So their blood is blue. That means when oxygen hits their gills, their blood literally turns into blue juice. You’re eating a creature with sky-colored circulatory fluid.
This blue blood is why they can survive in low-oxygen water. It’s more efficient in cold, dark places. So while you’re huffing and puffing at the gym, a lobster is chilling in a dark crevice, pumping blue blood through feathery gills. Perspective.
