Sea urchins are the pin cushions of the ocean. These fascinating creatures can be found in oceans all over the world, with a variety of species each displaying unique colors and spines. Sea urchins are echinoderms, which means they are closely related to starfish and sand dollars. They have a hard, round shell called a test that is covered in sharp spines, giving them their distinctive pin cushion appearance.

Sea urchins play an important role in marine ecosystems as they are herbivores, feeding on algae and seaweed. Their grazing helps maintain a healthy balance in the underwater environment. Despite their spiky exterior, sea urchins are actually quite fragile and can be easily damaged, so it's important to handle them with care if you ever come across one while snorkeling or diving.

For more information on sea urchins and their role in the ocean, you can visit the National Geographic website at www.nationalgeographic.com. National Geographic provides in-depth articles and stunning photographs of sea urchins in their natural habitat, giving you a closer look at these fascinating creatures.

If you're interested in learning more about sea urchin anatomy and behavior, the Monterey Bay Aquarium has a great online resource at www.montereybayaquarium.org. The website offers detailed information on different species of sea urchins, including the red sea urchin which is commonly found along the west coast of North America.

Whether you're a marine enthusiast or just curious about the creatures that inhabit our oceans, sea urchins are sure to capture your interest with their unique appearance and important ecological role. Next time you're at the beach or exploring a tide pool, keep an eye out for these prickly little creatures and marvel at the wonders of the underwater world.

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