Octopuses: These marine creatures have three hearts—two pump blood to the gills, while the third circulates it through the body, supporting life in the ocean depths
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Spiders: Certain spider species possess multiple heart-like structures that circulate both blood and hydraulic fluid, aiding in movement
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Squids: Like octopuses, squids also have three hearts. Two supply oxygen to the gills, while the central heart distributes it throughout their body
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Hagfish: With four hearts, one serves as the primary pump, while the others act as auxiliary pumps to assist blood circulation
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Cuttlefish: These cephalopods have three hearts—two direct blood to the gills, and the third pumps oxygen-rich blood to the rest of the body
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Starfish: Instead of a traditional heart, starfish use a water vascular system with pulsating structures that function like hearts, circulating fluids throughout their bodies
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Horseshoe Crabs: Equipped with a tubular, segmented heart, horseshoe crabs efficiently pump blood to all parts of their body
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Earthworms: These invertebrates have five pseudo-hearts—muscular structures that pump blood through their segmented bodies to support survival and movement
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Cockroaches: Their multi-chambered heart, consisting of 13 chambers, ensures efficient blood circulation throughout their body
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Amphioxus: This simple marine animal relies on multiple pulsating vessels that act like hearts, maintaining blood flow in its primitive body