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The "roundest" animal would most likely be some type of small marine invertebrate. If you mean "roundest" as in spherical, the roundest would probably be the Giant Ostracod, a tiny deep-sea crustacean and is completely sphere-shaped. If you mean round in terms of circular, you could include any creature with radial symmetry, such as many echinoderms (like sand dollars, sea urchins, etc.) and many cnidarians (jellyfish!). Pillbugs and hedgehogs can curl up into completely round, protective spheres, and pufferfish can inflate into a spherical shape.

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12y ago
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9y ago

There are two planets that are close to being perfectly "round" (spherical).

They are Mercury and Venus.

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Q: What is the roundest animal in the world?
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