00:00Dive into the ocean's depths and you'll find the octopus, a creature that seems almost alien.
00:05With three hearts and blue blood, their biology defies our expectations.
00:10But how do these strange features help them survive?
00:13Two of their hearts, the brachial hearts, are dedicated solely to pumping blood through the gills.
00:18The third, a systemic heart, circulates this newly oxygenated blood to the rest of the body.
00:24Interestingly, this main heart stops beating when the octopus swims,
00:27which is why they often prefer to crawl along the seabed.
00:31Their blood is blue because it uses a copper-based protein called hemocyanin to transport oxygen.
00:36While less efficient than our iron-based hemoglobin in warm air,
00:40hemocyanin is superior in the cold, low-oxygen water of the deep sea.
00:44This incredible circulatory system, combined with a decentralised brain that gives each arm a mind of its own,
00:50makes the octopus a true master of survival in its underwater realm.
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