The manta ray night snorkel on the coast of hawaii is the only place in the world that has resident manta rays that consistently come to feed at the same locations throughout the year hawaii manta rays have a wingspan of 4 16 feet across and can weigh up to 1000 pounds unlike other rays mantas have no teeth stinger or barbs so they are completely safe to be around they are filter feeders with plankton as their only source of food lights are placed in the water which attract the plankton