Large school of dozens of scalloped hammerhead shark converging towards the surface, silhouetted against the blue water, Cocos Island.

carcharhiniformes cocos island costa rica pacific ocean selachimorpha sphyrna sphyrna lewini sphyrnidae animal animal themes aquatic backlit blue carnivore cartilaginous fish chondrichthyes color image danger day directly below elasmobranch endangered species fish full length ground sharks group of animals group of fish hammerhead shark illuminated large group of animals marine biology natural light neotropics no people ocean ominous on the move outdoors photography predator scalloped hammerhead shark school of fish sea sea life shark shining shoal side view silhouette sunlight swimming undersea underwater wide angle wildlife zoology