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FOR KIDS: Between a rock and a wet place

If you’re a fish that climbs waterfalls, is it better to have a squat body, or be tall and a fast swimmer?

Life is anything but a vacation for a climbing goby, a small fish that lives in Hawaii. Usually shorter than your thumb, this fish hatches in freshwater high in the hills and mountains. But soon afterward it’s swept out to the salty sea by strong currents.

About six months later, the fish begin the long journey back upstream to freshwater above waterfalls. It’s a good place for climbing gobies to breed because their natural predators — mainly other fish — can’t get to them above the falls.

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