Of the 338 bird species studied in India for changes in numbers over the last 30 years, 60% have experienced a decline, says a new report based on data from about 30,000 birdwatchers across the country.
Also, 40% (142) of the 359 species evaluated for change over the last seven years have declined, according to the report titled “State of India’s Birds”.
The assessments rely on three indices: two are related to the change in abundance — long-term trend (change over 30 years) and current annual trend (change over the past seven years) — and the third is a measure of distribution range size within India.
Of the total of 942 species evaluated, long-term trends could be determined for 338 species. Of these, 204 species have declined, 98 are stable and 36 have increased,
— source newsclick.in | 25 Aug 2023