Why are starfish named starfish?

The word "starfish" is a misnomer. Starfish are not fish, but rather echinoderms, a phylum of marine invertebrates that also includes sea urchins, sand dollars, and sea cucumbers. The name "starfish" likely comes from the animal's unique shape, which often resembles a star.

Here are some additional facts about starfish:

* They have a unique water vascular system that they use for locomotion, feeding, and respiration.

* They have a radial symmetry, meaning that their body parts are arranged around a central axis.

* They have no brain or central nervous system, but rather a decentralized nervous system.

* They are carnivorous and feed on a variety of small animals, including mollusks, crustaceans, and worms.

* They can regenerate lost limbs, and some species can even regenerate entire body parts.

* They are found in all oceans, from the shallows to the deep sea.