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What did the Indian Veterinary Research Institute find to be the actual cause of the 2019 Sambhar Lake mass bird deaths?

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1. What did the Indian Veterinary Research Institute find to be the actual cause of the 2019 Sambhar Lake mass bird deaths?

Avian botulism, a toxin-driven disease linked to heavy rainfall that year

Illegal salt mining releasing toxic chemicals into the water

A viral outbreak spread by migratory birds from Siberia

Pesticide runoff from nearby agricultural fields

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