A cuttlefish changes colour faster than almost anything else on the reef, and this one is a juvenile doing it while the camera was on it.
Its blood is green-blue rather than red, because it carries oxygen with copper where most animals use iron. Copper carries much less of it, so the blood has to move faster, and three hearts move it: one for each gill, and a third for the rest of the animal.
Three hearts, and blood that has to hurry. Lembeh Strait, north Sulawesi.
A juvenile cuttlefish in red, the Lembeh Strait.
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Eight lines from the dive
Photographed in Lembeh Strait
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