Green sea turtle being cleaned by reef fish off the Kona Coast, Big Island, Hawaii (© Masa Ushioda/Aurora Photos)

【May 23 2013】At first glance, this green sea turtle appears to be giving his fish buddies a ride in honor of today's World Turtle Day. But something else is going on here. Each day, reef fish like these gather in a symbiotic "cleaning station" to clean off turtles' shells. The fish eat algae and parasites that naturally accumulate on the turtle. Explore breathtaking Gallery from the HuluTrip homepage over the past 5 years..