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In their second year, ospreys return to the region of their birth to find an appropriate location for a nest , such as this platform, a dead tree or a piling. There they may pair off, and a young pair may practice building a nest without actually laying eggs, a behavior called false nesting. Generally in their third year a pair nests for real and produces eggs for the first time, and in years after that they return to the same nest and add to it.