Have you ever stepped on Sea Urchin? I know I haven’t and I don’t want to start today. Whats a sea urchin? A sea urchin is a marine animal that has a flattened shell with spikes covering. A sea urchin has a mouth on the underside. If your ever find a dead sea urchin, you can scrape of the spikes and underneath is a beautiful circular shell. Because a sea urchin can be different colors (purple, green, brown, black, and many other colors) the shell will be that same color. Remember to watch your step next time your at the beach!