read more at

http://economictimes.indiatimes.com/environment/flora--fauna/mass-bird-deaths-rare-not-apocalypticexperts/articleshow/7231751.cms
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Thank you for information abhishek dua, keep posting more and more information.

Slow and Steady Wins the Race.

Environmental imbalance can make even very rare things occur common.
You are right rajani, environment imbalance be the reason for mass bird deaths rare

Slow and Steady Wins the Race.

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