on their mother during a critical period that is usually withina few hours after hatching. This behavior serves them well,because in many species of ducks and geese, it would be hardfor the mother to keep track of all her offspring as they walk orswim. After imprinting takes place, the offspring keep track ofthe mother. The survival of the young ducks requires that they quicklylearn to follow their mother’s movements. Lorenz raised greylag geese from eggs, and soon after they hatched, he used himself as the model for imprinting. As a result, the young goslings
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