Cockroach

Octopus

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Hagfish

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Earthworm

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Annelids (Segmented worms)

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Squid

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Cuttlefish

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Cockroach

Cockroaches have a tubular heart with multiple chambers. Their circulatory system consists of 13 chambers that help in pumping blood.

Octopus

Octopuses have three hearts. Two of the hearts pump blood to the gills, and the third heart circulates blood to the rest of the body.

Hagfish

Hagfish have four hearts. These primitive marine creatures possess a main pump and three accessory pumps that aid in circulating blood throughout their body.

Earthworm

Earthworms have five pairs of "aortic arches," which act as simple hearts. These arches help pump blood and distribute it throughout the worm's body.

Annelids (Segmented worms)

Squid

Similar to the octopus, squid also have three hearts. Two hearts pump blood to the gills, and the third heart circulates oxygenated blood to the rest of the body.

Cuttlefish

Cuttlefish also have three hearts. Two hearts are dedicated to pumping blood to the gills, while the third heart supplies oxygenated blood to the body.