dolphin swims around the corals

flipper marine cetacean playful oceanic bottlenose aquatic mammal intelligent echolocation coastal tail jump pod dorsal spinner social blue gray friendly nose ocean atlantic pacific tursiops whistle communication leaping dolphinaria fin corals reef polyp coraline tropical fringing staghorn barrier symbiotic algae biodiversity ecosystem soft hard calcium exoskeleton colorful bleaching branching coralite restoration corallogy underwater colony lagoon atoll scleractinia pocillopora great dolphin fish