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Bird’s Migration: What, Why, When and where?
Approximately 10,000 species of birds are known on Earth. Slightly less than half are migratory. A total of about 4,000 species of birds migrate back and forth between their breeding and wintering grounds. About two-thirds of them travel long distances, flying up to 20,000 kilometres a year. And there are even more impressive figures. The cuckoo, … Read more
