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These are Gangetic dolphins, a species of river dolphin - and India's national aquatic animal - that's found largely in the Ganges-Brahmaputra river system in the northern part of the country.

A new survey finds India's rivers host around 6,327 river dolphins - 6,324 Gangetic and just three Indus dolphins.

In 2009, the Gangetic river dolphin was declared India's national aquatic animal to boost conservation.

Mr Sinha believes that increased vessel traffic could push Gangetic dolphins towards extinction, much like it did to Baiji dolphins in China's Yangtze river.

This is the text’s central theme as it was written in about 500 BC, when there was a shift from tribal multiculturalism to bigger settlements led by kings along the Gangetic plain.