The Ianthina nudibranch, also known as the "blue dragon," earns its nickname from its resemblance to a mythical dragon and its bright blue-purple coloring, which comes from storing symbiotic algae called zooxanthellae that it harvests from its prey. This nudibranch has the unique ability to photosynthesize, using algae (zooxanthellae) it harvests from its prey to convert sunlight into energy.