Look up. Above the noise and rush of India’s megacities, an ancient and spectacular drama unfolds every year. Millions of birds, following routes etched over millennia, fly right across our urban skies on their epic migratory journeys.
The Avian Superhighway Above
India occupies a crucial
position on the Central Asian Flyway (CAF), one of the world's nine major migratory routes for birds. This aerial superhighway stretches from the Arctic and Siberia all the way to the Indian Ocean, covering 30 countries. Every year, over 180 species, including ducks, geese, waders, and raptors, travel this path to escape harsh northern winters in search of warmer climates and food. Many of these birds, like the iconic bar-headed geese that fly over the Himalayas, rely on India's wetlands and coastal areas as vital stopover points or their final wintering destination. It is not just a fleeting visit; India provides critical habitat for over 90% of the bird species that use this flyway.
Delhi: A Capital Stopover
As the second most bird-rich capital city in the world, Delhi is a prime example of this urban-wildlife intersection. Despite its high levels of pollution and urban density, the city's wetlands and the Yamuna River attract thousands of migratory birds each winter. Water bodies like the Okhla Bird Sanctuary and even smaller, lesser-known ponds become temporary homes for species arriving from as far as Russia and Siberia. Visitors flock to the Yamuna's banks to see huge congregations of Siberian gulls, while birdwatchers can spot Northern Shovelers, Common Pochards, and various sandpipers resting before continuing their journey. Studies have found that a significant portion—up to 40%—of the birds observed in Delhi's urban ponds are migratory, highlighting the city's surprising importance as a refuelling station.
Coastal Havens: Mumbai and Chennai
Along the coast, other metropolises serve as critical sanctuaries. Mumbai's Thane Creek becomes a sea of pink every year with the arrival of tens of thousands of flamingos, who migrate from Gujarat, Rajasthan, and even parts of West Asia. The city's mudflats and mangroves provide the perfect habitat rich in algae and small organisms for them to feed on. Similarly, Chennai’s Pallikaranai Marshland, one of the city's last surviving natural wetlands, is a vital stop on the CAF. It regularly hosts over 40,000 migratory birds, including Northern Pintails, Grey-headed Lapwings from East Asia, and various sandpipers. These coastal wetlands are indispensable 'motels' for birds undertaking exhausting transcontinental flights.
The Perils of the Urban Jungle
However, this coexistence is fraught with challenges. Rapid urbanisation, pollution, and infrastructure development are placing immense pressure on the very ecosystems these birds depend on. Wetlands in cities like Kolkata, Chennai, and Bengaluru are shrinking due to encroachment for buildings and roads. Water bodies suffer from sewage inflow and industrial pollutants, which destroy the food chain that sustains the birds. Artificial light and noise pollution disorient birds, while glass_fronted buildings cause fatal collisions, especially for those migrating at night. The result is that many generalist species like crows and pigeons thrive, while specialist and migratory birds decline.
A Rising Flock of Citizen Naturalists
The good news is that awareness is growing. Across India, citizen science initiatives are playing a crucial role in monitoring bird populations and advocating for conservation. Organisations like Bird Count India and local birdwatching clubs in cities like Mumbai, Pune, and Bengaluru empower ordinary citizens to contribute valuable data through apps like eBird. These programmes help track bird distribution, flag population declines, and identify important habitats that need protection. Events like the Great Backyard Bird Count or the Karnataka Rajyotsava Bird Count encourage people to simply step outside, observe, and document the avian life around them, fostering a connection with the nature that shares their urban home.
