For generations, the house sparrow has been part of India’s everyday soundscape. Nesting in roof spaces, feeding near homes and markets, and appearing in balconies and courtyards. Today, however, many of the spaces that once accommodated the bird are changing. Older houses are giving way to sealed apartment buildings. Open areas are being paved. Green spaces are becoming fragmented, while traffic and construction are reshaping urban habitats.

Across Indian cities, the spaces house sparrows once used for nesting and feeding are becoming harder to find. This has led to severe decline in the number of sparrows in urban areas.

Why March 20 is World Sparrow Day

World Sparrow Day has been observed every March 20 since 2010. It was initiated by the Nature Forever Society, an India-based conservation organisation, to raise awareness about the house sparrow and declining populations of common birds. The initiative has since become an international observance.

In India, the campaign has also helped bring urban bird conservation into the public conversation. Delhi declared the house sparrow its state bird in 2012.

Are Sparrows Disappearing from India?

The house sparrow remains widespread, and available evidence does not support treating the species as uniformly declining across every part of India. Recent research from Karnataka illustrates the point. A study of 16 small and medium-sized cities recorded 57 bird species, with the house sparrow ranking among the five most abundant species observed. Researchers recorded 118 house sparrows during the survey.

But abundance in one region does not rule out declines elsewhere. Government and conservation reports have pointed to loss of nesting spaces, habitat changes and reduced food availability as potential pressures on urban sparrows. Rather than a nationwide disappearance, India is seeing a more uneven picture, with sparrows persisting in some urban areas and declining in others

The Architecture Problem

For a bird that commonly nests in cavities, buildings are more than structures. Rapid urbanization has destroyed their habitat. Older houses often had gaps beneath roofs, openings in walls and other spaces where sparrows could build nests. Modern construction tends to seal these spaces.

The result is an unintended shift in urban ecology: buildings may become more efficient and secure for people while providing fewer nesting opportunities for birds. Government sources have previously identified the replacement of older houses and courtyards by concrete multi-storey construction as one factor affecting sparrow habitat.

Survival in Question?

Food availability is another part of the story. Sparrows can feed on grains and seeds, but insects are important in the diet of growing chicks. Changes in vegetation and pesticide use can therefore affect the food available during the breeding season. This means putting out grain on a balcony may help individual birds, but it cannot replace the wider habitat they require.

A functioning urban habitat needs food, nesting sites, water and vegetation—not just bird feeders. Recent research in Karnataka adds another dimension to the urban bird story. The study found that the number of motor vehicles and the amount of local greenery were among the most important environmental factors associated with bird species richness and diversity across the cities surveyed.

Researchers found that greenery can provide opportunities for feeding and breeding, while traffic can create disturbance. The finding is significant because urban biodiversity is not determined only by large parks. Street trees, gardens, shrubs and smaller patches of vegetation can also shape which birds are able to live in a neighbourhood.

What Cities Can Do?

Sparrow conservation does not necessarily require large-scale wildlife projects. Nest boxes can provide alternative nesting spaces where natural cavities are unavailable. Native plants can support insects and provide food and shelter. Clean water sources can become particularly important during hot weather.

Building renovations can also take wildlife into account by avoiding the unnecessary destruction of active nesting sites. In Chennai, for instance, the Koodugal Trust has involved schoolchildren in building sparrow nest boxes. A PIB report said the organisation had built more than 10,000 nests between 2020 and 2024.

At Delhi’s National Zoological Park, World Sparrow Day activities in 2025 included a sparrow count and the distribution of 100 nest boxes to students and visitors.

Why the Sparrow has Become an Urban Warning Sign

The house sparrow is not India’s most threatened bird, nor does its presence alone measure the health of an ecosystem. Its importance is different. It is a species that has learned to live alongside people. When its habitat changes, the effects can be observed at the level of homes, streets and neighbourhoods.

That makes the sparrow an accessible entry point into a much larger issue of how India’s rapidly expanding cities can accommodate its biodiversity as well as people.

India’s urban population and built environment will continue to grow. Development will bring new roads, buildings and infrastructure. The conservation challenge is not to stop that growth, but to understand what ecological space is being lost in the process. For the house sparrow, that could be something as small as a cavity in a wall, a patch of vegetation, a supply of insects or a quiet corner in which to raise its young.