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Bird Migration
 What is migration?
The migration of birds is a natural phenomenon that occurs on a global level.
The migr...
Bird Migration
Western Route
From Central and Eastern Europe the birds go to the Alps or Pyrenees Mountains. Then, the
mig...
Bird Migration
In the case of swallows (Hirundinidae) and house martins (Delichon urbicum) are birds that we
will see over...
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