The giant manta ray (Manta birostris) is the largest species of ray in the world. Though normally a solitary creature, large groups of these gentle giants sometimes congregate in food-rich waters, swimming in slow looping somersaults to concentrate the plankton they are feeding on. It is a sight that attracts divers from all over the world. During the mating season, a huge fish may be seen to jump clear of the water, then flop back with a loud slap. A sharp-eyed observer will also see the remora fish clinging to the underside of the manta, feeding on scraps it misses and the parasites on its skin.
The manta is usually quite happy to be watched. It is thought to like the feel of the divers' air bubbles, and enjoys being touched - but touching is not encouraged. Sores can develop where there is damage to the layer of mucus protecting the ray's skin.