TIL Octopus have 9 brains, 3 lungs and blue blood. Each of its 8 arms has one mini-brain, and one central brain. The blue blood is because the protein, haemocyanin, which carries oxygen around the...

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The original was posted on /r/todayilearned by /u/TheQuietKid22 on 2023-06-27 06:40:46+00:00.

Original Title: TIL Octopus have 9 brains, 3 lungs and blue blood. Each of its 8 arms has one mini-brain, and one central brain. The blue blood is because the protein, haemocyanin, which carries oxygen around the octopus's body, contains copper rather than iron...