One interesting fact about dolphins is that they use many unique ways to communicate with one another. They also use high-frequency clicking sounds to investigate their surroundings.
Dolphins use a variety of squeaks, whistles, and movements in order to communicate. They can jump up to 20 feet in the air, slap their fins on the surface of the water, and butt heads with one another.
When dolphins make clicking sounds that hit an object in the water, like a shark or a whale, they bounce off and come back to the dolphin as echoes. The echo tells the dolphin the shape, size, speed and location of the object, in addition to the object's distance from the dolphin.
Female dolphins are called cows, males are called bulls and young dolphins are called calves. The young dolphins often stay with their mothers for two or three years before swimming away on their own. Their groups, called schools, usually contain no more than 12 total dolphins.
Dolphins are extremely intelligent. Much like dogs, many dolphins are trained by humans to perform incredible tricks and to let other humans ride on them. They often display a playful demeanor and enjoy jumping out of the water and riding waves.