BOSTON — Evolution has stuck Hawaiian fish called stream gobies between a rock and a scary place.
A Sicyopterus stimpsoni goby shorter than a thumb has to climb the rocks of waterfalls, sometimes several hundred feet high, on a juvenile migration upstream. But to reach those falls, the fish has to pass through a kill zone of lowland waterways full of predatory fish, explains Richard Blob of Clemson University in South Carolina.
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