The Delhi Bird Atlas — released on World Environment Day, 5 June 2026 — confirms what birders have long suspected: Delhi, with 471 documented species, is the second most bird-diverse national capital in the world after Nairobi, anchored by the Aravalli Ridge, the Yamuna floodplains and Delhi’s location at the heart of the Central Asian Flyway.
Developed by the Delhi Forest Department in partnership with Bird Count India, WWF India and citizen-volunteer birdwatchers, the atlas is a grid-based, two-season, multi-year survey. Delhi has been divided into 6.6 km × 6.6 km cells, each further sub-divided into smaller quadrants; 145 sub-cells were randomly selected to cover 11% of the city’s area. Each sub-cell required four 15-minute checklists per season, recorded on foot and uploaded to eBird. In the first year (Jan 2025-onwards), 221 species were recorded across Delhi — 200 in winter, 152 in summer. Of these, 126 are resident, 81 winter migrants and 14 summer migrants. The Atlas separately catalogues 22 species not re-recorded since 1975 — a quiet warning of urban habitat loss.
📜 Constitutional / Statutory Anchor
Wildlife (Protection) Act 1972 — Schedule I species (after the 2022 consolidation) enjoy absolute protection; the Egyptian Vulture (Endangered) and Black-bellied Tern (Endangered) recorded by the Atlas fall into the highest-protection tier. Convention on the Conservation of Migratory Species (CMS), Bonn Convention 1979 — recognises the Central Asian Flyway as one of nine global flyways; India is a Party. Ramsar Convention 1971 — Yamuna floodplains’ associated wetlands are functionally Ramsar-adjacent. Biological Diversity Act 2002 — implements the Convention on Biological Diversity 1992. Article 48A — DPSP on environmental protection. Article 51A(g) — fundamental duty to protect the natural environment.
The institutional significance of the Atlas is methodological. India lacked a city-scale, sub-cell-randomised, two-season bird-atlas protocol until the Mysuru City Bird Atlas (2014-16) and the Kerala Bird Atlas (2015-20). Delhi’s edition imports those methods to a megacity at the heart of the Central Asian Flyway — a route stretching from the Arctic Ocean and Siberia, down through Central Asia, to the Indian Ocean. The flyway is the primary reason Delhi accommodates 81 winter migrants. The Aravalli Ridge brings Western Indian arid-zone species into the capital; the Yamuna’s floodplain wetlands support water-birds; and proximity to the Western Himalayas enables seasonal vertical migration. The Atlas’s identification of 18 endemic species — including the Endangered Egyptian Vulture, Black-bellied Tern, Common River Tern, and the Vulnerable Painted Stork, Black-headed Ibis and Oriental Darter — is a powerful Schedule I evidentiary base.
🎯 Key Facts at a Glance
- Total species: 471 (plus 22 not re-recorded since 1975).
- Global rank: 2nd most bird-diverse national capital after Nairobi.
- Methodology: 6.6 × 6.6 km cells; 145 sub-cells; 4 × 15-min checklists per sub-cell per season.
- First-year recordings: 221 species (126 resident, 81 winter migrant, 14 summer migrant).
- Feeding ecology: 224 invertebrate feeders; 108 plant/seed; 32 omnivores; 34 vertebrate/carrion; 33 fruit/nectar; 9 raptors.
- Endemic / Schedule I: 18 endemic species including Egyptian Vulture, Black-bellied Tern.
The comparative context places Delhi within a global flyway architecture. The CMS Bonn Convention 1979 identifies nine global flyways — the East Atlantic, the Mediterranean/Black Sea, the East Africa-West Asia, the Central Asian, the East Asia-Australasian, and others. India sits at the intersection of three. The Ramsar Convention 1971 protects “wetlands of international importance”; India now has over 80 designated Ramsar sites, several within reach of the Yamuna’s bird-rich stretches. The MC Mehta v. UoI line on Yamuna pollution, the Supreme Court’s TN Godavarman jurisprudence on forest conservation, and the Aravalli Notification 1992 prohibiting illegal mining are the legal scaffolding that protects the very habitats the Atlas catalogues.
⚖️ CLAT Angle
Expect a Legal Reasoning passage on whether the Wildlife (Protection) Act 1972’s Schedule I protection extends to migratory species transiting India under the CMS Bonn Convention 1979 — yes, by virtue of Section 2(37) WLPA read with the 2022 amendment harmonising the Act with CMS-listed taxa. A Current Affairs set may quiz the global rank (2nd, after Nairobi), the 471 figure, the Central Asian Flyway, and India’s Ramsar site count. Cross-reference MC Mehta v. UoI (1996) on the Taj Trapezium, TN Godavarman Thirumulpad v. UoI (1996) on forests, and the polluter-pays + precautionary principles established in Vellore Citizens Welfare Forum (1996).
The road ahead is structural. The Atlas will run for at least two years; subsequent editions will track climate-driven shifts in arrival dates of winter migrants — a leading indicator of regional warming. Forest-Department conservation actions are expected to focus on Yamuna floodplain restoration (overlapping with the National Mission for Clean Ganga’s Yamuna sub-basin work), Aravalli afforestation under the Aravalli Green Wall Project, and zonal protections for the 18 endemic species under Section 38 of the WLPA.
💡 Why This Matters for CLAT 2027 Aspirants
Pair the 1972 WLPA (Schedule I) with the CMS Bonn Convention 1979 and the Ramsar Convention 1971. Memorise Articles 48A and 51A(g) — the environmental DPSP + fundamental-duty pair both inserted by the 42nd Amendment 1976. The polluter-pays principle from Vellore Citizens Welfare Forum v. UoI (1996) 5 SCC 647 and the precautionary principle from the same case are perennial CLAT favourites.
📝 Test Yourself — 10-Question Quiz
Take the interactive quiz below to reinforce these concepts:
Practice Quiz — 10 CLAT-Style Questions
Click an option to reveal the answer and explanation.
