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A study of Delhi's Asola-Bhatti Wildlife Sanctuary found that abandoned mining areas are its most bird-rich habitat.
Surveys in 2024 recorded 130 bird species from 20 orders and 55 families across 15 habitat types.
Standardised richness was highest in the Abandoned Mine habitat (45.6 species) and lowest in Lantana woodland (13.1).
The research was part of an integrated management plan for the sanctuary funded by the Delhi Forest Department, with Wildlife Institute of India researchers.
The sanctuary sits on the Southern Delhi Ridge, the northern tail of the Aravallis. Its core starts near Tughlaqabad Fort and runs south to the old Bhatti mine pits, now wetlands, at the Haryana border.
GS Paper 3 > Environment > Protected areas and ecological restoration
Northern end of the Aravalli range running through Delhi, protecting the city from the Thar's dry winds
Variety of habitat types in an area; more variety usually supports more species