When one heart isn’t enough: 5 animals with multiple hearts

Many animals defy the single-heart norm, adapting to diverse environments with multiple hearts. Octopuses and squids utilize three hearts for efficient circulation and oxygen delivery, while hagfish boast four hearts to thrive in low-oxygen depths. Earthworms, uniquely, employ five pairs of aortic arches to circulate blood throughout their segmented bodies, showcasing nature's innovative solutions.

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