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Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Zugunruhe is a German compound word consisting of Zug (move, migration) and Unruhe (anxiety, restlessness). In ethology it describes anxious behavior in migratory animals, especially in birds during the normal migration period. When these animals are enclosed, such as in an Emlen funnel, zugunruhe serves to study the seasonal cycles of the migratory syndrome. Zugunruhe involves increased activity towards and after dusk with changes in the normal sleep pattern. Researchers have been able to study the endocrine controls and navigational mechanisms associated with migration by studying zugunruhe.

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