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A pufferfish can puff up like a balloon.

A pufferfish can puff up like a balloon.

When it feels worried, it gulps water and blows up into a round, spiky ball.

🐟 All Ocean Animals facts →

More facts about Ocean Animals

Octopuses have three hearts and blue blood. Octopuses have three hearts and blue blood. A seahorse dad is the one who carries the babies. A seahorse dad is the one who carries the babies. Clownfish live safely among the waving arms of a sea anemone. Clownfish live safely among the waving arms of a sea anemone. A jellyfish has no bones, no heart, and no brain. A jellyfish has no bones, no heart, and no brain. Sea otters hold hands while they sleep so they don't float apart. Sea otters hold hands while they sleep so they don't float apart.