Random Fact: Starfish
Starfish (or sea stars) aren’t fish, they belong to the Phylum Echinodermata, which means they are related to sea urchins, sand dollars and sea cucumbers. There are around 2000 species of starfish, and while the most well-known have five arms, some have more. The sun star, for instance, has up to 40 arms.
If a starfish loses an arm, it can regrow it. In fact, it can lose up to four arms at a time and regrow them; it takes about a year for an arm to regenerate. However, the lost arm can also regrow the rest of the starfish, provided it has a portion of the central disc with it!