Bird migration
Bird migration is a seasonal movement of some birds between breeding and wintering grounds that occurs twice a year. It is typically between northern and southern regions.
Bird migration is a seasonal movement of some birds between breeding and wintering grounds that occurs twice a year. It is typically between northern and southern regions.
Bird migration is a seasonal movement of some birds between breeding and wintering grounds that occurs twice a year. It is typically between northern and southern regions.
Source: Wikipedia "Bird migration" · CC BY-SA 4.0
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