Common bottlenose dolphin and Pacific white-sided dolphin are mammals, alligator snapping turtle are reptiles, and Sand tiger shark are fish.

When viewed from underwater, their white bellies allow them to blend in with the sunlight, making them harder to spot by other creatures.

Common bottlenose dolphin can swim at speeds of 30-40 km/h and Pacific white-sided dolphins can swim at speeds of 50 km/h.

The octopus has one brain in the center of its body and a small brain in each of its eight arms. By the way, there are three hearts.

The orca is said to be the fastest of all cetaceans at 55 km/h.