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It takes decades for some migratory animals to learn their routes, and this knowledge can be lost in a generation if their journeys are interrupted.
Every spring, herbivores such as bighorn sheep and elk migrate to higher latitudes or altitudes, following the appearance of tender and particularly nutritious new vegetation as it emerges from the melting snow. The behaviour is known as “surfing the green wave”. But is knowledge of these routes inherited genetically, or must it be learned?
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To answer this question, ecologist Brett Jesmer …