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4
Easy
25 min
Published 2011
Unlike most freshwater fish, salmon have the ability to move freely between rivers and oceans because their bodies can adjust to changes in salt content. When it’s time to lay their eggs and let the cycle begin again, and they always know when it is, salmon make the treacherous journey home, swimming upstream, navigating their way over rocks and through waterfalls, dodging predators, travelling hundreds of miles to return to the exact place they were born. When I teach trainees, I often tal