Huge numbers of the birds have flocked to Mumbai, the capital of Maharashtra state in western India, with photos of the flamingos becoming a hit with birdwatchers on social media.
The birds traditionally migrate to the area for feeding from September to the end of May, according to Rahul Khot, assistant director at the Bombay Natural History Society (BNHS).
Last year a record 134,000 flamingos were counted in the area, but Khot believes a new record will be set this year.
BNHS had already counted 125,000 flamingos before its work was disrupted by India's coronavirus lockdown measures, introduced on March 25, said Khot, who expects the population to surpass the previous record by the end of May.
The birds have spread to wetlands where they were previously a rarity, added Khot.
They are being reported from places where they have earlier been reported less in number because there is no human activity there now," he said.
Removing human pressure on the environment allows us to appreciate the importance of the wetlands in Mumbai, he added.