The compilation of results of the counting task, being taken up to commemorate the birth anniversary of noted ornithologist late Dr Salim Ali, known as the 'bird man of India', is likely to take about a month, a BNHS official said.
The 'Salim Ali Bird Count' is organised by BNHS in partnership with Bird Count India, a collective group of many organisations across the country working towards documenting and monitoring birds.
"When they are done with the counting, they should note down the details of their observations, complete lists of all species spotted, and then upload all the information on the 'ebirds' website from where our society will download, analyse and circulate the findings," said Sathe.
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"Whenever a large number of people take part in an initiative, many hidden facts are unfolded and this is what we want to repeat in this massive survey. Though we have presence in almost three fourths part of the country, it is also true that our associates cannot reach every place where birds can reach," he said.
BNHS is one of the largest NGOs in India engaged in conservation and biodiversity research.
Many prominent naturalists, including ornithologist Salim Ali, have been associated with it.