#Starfish Are #Not Actual #Fish - Like sand dollars and sea urchins, starfish do not have backbones, which means they’re invertebrates.

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.

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.