The colors and patterns of this fire urchin are as bright as a string of holiday lights, and seem to

The colors and patterns of this fire urchin are as bright as a string of holiday lights, and seem to be lit from within. You’ll most likely encounter one of these colorful characters in the inshore areas of the House Reef and other sand-bottom dive sites. They are usually easy to spot, and they grow to diameters of eight inches. (Photograph by Erik Schlogl)