Dolphins behave this way throughout their entire lives. When dolphins play they. . . And when dolphins fight, they don't rub each other, and they approach each other directly or at right angles. Scientists can identify individual dolphins by size and physical markings such as. . . Scars come from wounds inflicted by other dolphins when they fight or play, or from sharks and other predators.
Some scars even come from boat propellers hitting the animals.
My Adventures on Ampato .