Dolphins are essentially drafting boats in reverse. When the dolphin swims through the water (or anything going through a fluid e.g. jet fling through air) it creates an area of high pressure in front of it as the water tries to go around, and an area of low pressure as the water needs to fill the void behind the dolphin that it once displaced. The boat fills the void behind the dolphin essentially giving the dolphin a free speed boost.
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