#Starfish Are #Not Actual #Fish - Like sand dollars and sea urchins, starfish do not have backbones, which means they’re invertebrates.
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Not All Starfish Are Star-Shaped - The crown of thorns starfish (Acanthaster planci), for example, is reported to have up to 21 arms. Likewise, sunstars—starfish aptly named for their resemblance to the sun—have about 12 arms.
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They Can Regenerate Lost Limbs - Starfish have the ability to regenerate lost limbs in cases of injury—for example, if they are hit by a rock from crashing tides. In fact, starfish are able to regrow an entire body from just one arm and at least one-fifth of their central disk.
They Don't Have Any Blood - Rather than blood coursing through their veins, starfish have a water vascular system—canals that pump seawater throughout the starfish’s body.
Starfish Are Carnivores - These innocent-looking creatures don’t just feast on algae and plants. Starfish are known to feed on creatures like injured fish, oysters, mussels, clams, and sand dollars.
Starfish Digest Outside Their Bodies - Once they have opened their food, they extend their stomach outside of their mouth and envelop their prey with their stomach.
