1. Sea Urchins: These are easily recognizable by their round, spiny bodies. They are found in all oceans and play a crucial role in the ecosystem by grazing on algae.
2. Starfish (Sea Stars): While not as spiky as some other echinoderms, starfish have tiny, sharp spines covering their bodies. These spines help them move and protect themselves.
3. Sand Dollars: These flattened, disc-shaped creatures are also echinoderms. While they don't have the same prominent spines as sea urchins, they do have tiny, velvety spines that help them burrow in the sand.