P berthold and e gwinnd bird migration is an intriguing aspect of the living world so much so that it has been investigated for as long and as thoroughly as . Avian review is for bird book enthusiasts it shows by region various books that are current antique or simply unique sampel pages are provided to help the . Avian migratetm is a non toxic repellent that discourages geese and other birds from congregating on golf courses parks athletic fields airports . Avian migration o what is migration o history of avian migration o evolution of migration o navigation how do birds migrate o energetic demands of migration
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