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Earth’s largest predators sleep in groups of 5-6 whales, which drift with the current right beneath the ocean surface. They sleep vertically, and nobody yet knows why. It might be for safety, or even blood circulation.
Earth’s largest predators sleep in groups of 5-6 whales, which drift with the current right beneath the ocean surface. They sleep vertically, and nobody yet knows why. It might be for safety, or even blood circulation.