I took this photo, oops, I mean my wife took it while I held it at St. Andrews State Park in Florida. I was snorkeling and found a bunch of these urchins on a breakwater reef. If you look real close at the center you can see his teeth and mouth. I call them water porcupines. If you ever step on one, you will know what I mean.
Albert Moyer, Jr. 
We have them in the tidepools here along the San Diego coast. Pretty cool to see them in the wild as opposed to SeaWorld.
Yes, it is. It is fun to hold them too.