Dolphins breath through a hole
in the top of the dolphin which is called blowhole.
The blowhole can empty and refill the lung in one fifth of a second through an explosive blow which can reach
velocities up to one hundred miles per hour.
The blowhole is closed tightly with a group of strong muscles than surround him.
The air introduced through the blowhole, is conducted to the lungs for breathing, which is a huge difference with
fish who use gills to breathe.