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The world day of the migrating birds

The world day of migratory birds is celebrated every second Saturday and every second Sunday of May since 1993. The purpose of a holiday is the address of attention of society to global ecological changes which destroy ecosystems of winter and summer areas of the migratory birds, and also return of an environment habitual to species of migratory birds for reproduction, flight, incubations of eggs. Almost every tenth species of migratory birds is under the threat of extinction.