There are about 1,800 species of sea stars. They are among the most easily-recognizable marine creatures, although they come in a variety of shapes, sizes and colors. Sea stars (commonly called starfish) are classified in the Phylum Echinodermata, meaning they are related to sea urchins, sand dollars and sea cucumbers.
While some appear smooth, they all have spines covering their upper surface and a soft underside. If you gently turn over a live sea star, you'll see its tube feet wiggling back at you. These iconic marine animals are fascinating creatures. Learn more about them through photos and facts in this image gallery.
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