The Maryland researchers concluded that while many fish launchout of the water into the air to capture prey, migrate, or avoid predators, the guppies have a different evolutionary motive: to reach all the available habitat in Trinidad's mountain streams.
He was impelled to launch himself into unspoilt rivers simply out of love and compulsion, and because, ever since he had first sat in a kayak, picked up a paddle and found himself alone in wild Nature, he didn't want to do anything else quite as badly.