Although it cannot be proved, it is considered that humans and dolphins are the only creatures that have sex for pleasure.
Something else worth noting - a human can swim at a maximum speed of 6 mph (9.65 km/h) while a dolphin can swim at 35 mph (56 km/h).
The sound that a dolphin produces is called a click and it is different for every dolphin. It is some sort of a signature to them.
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