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

Actually, they only grow beards when they are babies. It is a legacy of the dolphins' ancestors' life on land. It disappears when they grow up, but only the pores remain.

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.

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

Rays have gill slits on the ventral side of their bodies, while sharks have gill slits on the side of their bodies.