Dolphins are very strong, powerful and energetic animals. They use their tail flukes to propel themselves through the water and often to propel themselves high into the air.
They will often leap out of the water in the waves created by the bow or the stern of boats (See bow riding). They will also often leap out of the water when they are playing with each other.
Wave often tail walks and leaps out of the water when she is on her own. I don’t know why dolphins jump; there may be several reasons, possibly to get a view of what is around them, a playful act and/or a way of expressing themselves.
In marine parks (Captivity) dolphins are made to do jumps to entertain people and to receive food. Luckily the Port River Dolphins are wild and free, they will leap out of the water when they want to.