The copper-based protein is more efficient at transporting oxygen molecules in cold and low-oxygen conditions, so is ideal for life in the ocean. Well, the blue blood is because the protein, haemocyanin, which carries oxygen around the octopus's body, contains copper rather than iron like we have in our own haemoglobin. Finally, why do octopuses have blue blood?Īre you still wondering why octopus blood is blue and what the three hearts do? The researchers say they're not sure what the benefits of living in a densely populated settlement are for these octopuses, but it may just be a case of necessity, with limited den spaces available in the otherwise flat and featureless area. Frequent aggression, chases and even den evictions were observed among the octopuses living at Octlantis. City living has its advantages and drawbacks, as we all know.
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