How often birders report each species in Telangana and Andhra Pradesh. This tracks reporting, not how many birds there are.
“12 per 1,000” means about 12 of every 1,000 eBird records that year were this species, measured against the typical species in the state.
A falling line means birders report the species less often. It doesn't count birds.
Districts keep fixed weights, so busier birding in one place doesn't skew results. Read the method
Data window: Telangana 2016–2024, Andhra Pradesh 2018–2024. Every month is included, bird-count weekends such as the Great Backyard Bird Count too.
Districts with at least 500 records every year each get a fixed weight. The index is each species' share of records, weighted by district. The trend is a Theil–Sen slope with a 90% range from 300 bootstrap resamples of the districts.
As birders log more species per outing, every species' share of the records drifts a little each year, with no change in the birds (Telangana −3.1% a year, Andhra Pradesh +0.2% a year for the typical species). Each species is measured against that typical species, so a decline here means falling faster than the rest.
Clear decline: −5% a year or worse, the whole range below −2%, and at least 25% down from the first three years to the last three. Possible decline: −3% a year or worse and at least 15% down. Increases mirror these. A species needs records in every year, at least 300 in all, about 20 a year, and from at least two districts for a verdict.
Data: eBird Observation Dataset, Cornell Lab of Ornithology, via GBIF (CC BY 4.0). Figures worked out 2 Oct 2026, and again every 3 days.
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