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Bird Migration:

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After more than 2,000 years of observations climaxed by a century of experimental studies, we are still not certain regarding many facets of migration. We have authentic data on breeding range, wintering quarters and many migratory routes of a large number of birds but we still are not in a definite stage to explain why birds go where they do at the time they do, and their manner of navigation is only partially understood. This paper focuses on the issue.
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License:[Source NCERT ]June 13, 2017, 5:43 p.m.

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