Animals
What Color Is an Octopus's Blood?
What color is an octopus’s blood?
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What is the answer: what color is an octopus's blood?
An octopus's blood is blue. It uses a copper-based protein called hemocyanin to carry oxygen, instead of the iron-based hemoglobin that turns human blood red.
Why is octopus blood blue and not red?
Octopuses carry oxygen with hemocyanin, which contains copper and turns blue when oxygenated. Copper-based blood works better in the cold, low-oxygen water octopuses live in.
Do all sea creatures have blue blood?
No. Blue blood is common in octopuses, squid, crabs and horseshoe crabs, but most fish and mammals have red, iron-based blood like ours.