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Starfish

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  • Starfish are also called sea stars due to their five-arm shape, but they are not a species of fish. A healthy starfish has five or more arms that branch out from a central disk and has tough skin with sharp, calcareous spines. They can sometimes lose an arm, which eventually grows back.National Geographic: Starfish Profile
  • Fast Facts

    1. Also called sea stars
    2. Are not fish
    3. Have five or more armsNational Geographic: Starfish Profile
    4. Only live in salt water
    5. Live in temperate and tropical waters
    6. Life span: Up to 35 years in the wildNational Geographic: Starfish Profile
    7. Invertebrates
    8. Carnivorous
    9. Able to regenerate limbs
    10. About 1600 speciesTree of Life: Asteroidea
    11. Crown of thorns starfish can damage coral reefsTree of Life: Asteroidea
    12. Have no bloodNational Geographic: Starfish Profile
  • Diet

    Starfish eat small fish, oysters, clams, sea urchins, mussels and arthropods. They consume food by moving their stomach through their mouth and into the shell of their prey, which they grab with their suction-cup-covered arms.National Geographic: Starfish Profile

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