The reported decline of the Indian roller across West Bengal is more than the disappearance of a familiar bird from seasonal landscapes. It points to a wider urban-ecology problem in which agricultural chemical use, shrinking tree cover and expanding infrastructure are altering the habitats and food systems on which common birds depend.
The Indian roller, known locally as neelkanth, was once frequently seen across the western districts of Bengal, particularly around farmland and on electrical wires. According to observations cited by Sangbad Pratidin, its numbers have fallen by roughly 50% over more than a decade. A local bird photographer from Purulia said the bird was still widely visible in the region until 2012-13, after which sightings began to decline.
The reported fall has also changed a longstanding cultural practice. On Vijayadashami, some royal and old aristocratic households traditionally released Indian rollers, reflecting the belief that the bird carries news to Lord Shiva about Parvati’s departure from the mortal world. The practice has been reduced as forest authorities have acted under wildlife-protection rules. That legal intervention has limited the ceremonial use of wild birds, but it has not addressed the ecological conditions that may be reducing their numbers in the first place.
The evidence currently available is uneven. The source report says bird researchers have observed a decline of approximately 50%, but also acknowledges that a specific investigation into the Indian roller’s status has not been adequately submitted to the State of India’s Birds 2023 assessment. This distinction matters. A visible reduction in sightings is an important warning, but it is not the same as a complete population study covering the species’ range, breeding success, mortality and habitat conditions.
That gap makes the Indian roller a useful indicator of a larger evidence problem. Birds that were once common can disappear gradually without triggering the same institutional response as a sudden wildlife incident. By the time the decline becomes noticeable to photographers, farmers or residents, changes in land use and food availability may already have become difficult to reverse.
## A food-chain problem in the countryside
The Indian roller is generally associated with open landscapes, farmland and perches such as trees and electrical lines. The source report identifies falling insect availability as one possible reason for the decline. Excessive pesticide use in agricultural fields can reduce insects and other small organisms that form part of the bird’s food supply. If that assessment is correct, the decline is not simply a bird-conservation issue; it is also a consequence of how agricultural land is managed.
This relationship is important for urban readers because the boundary between city and countryside is becoming less distinct. West Bengal’s towns and expanding urban edges increasingly sit alongside cultivated land, ponds, roadside vegetation and fragmented tree cover. These transition zones support birds, insects and other species, but they are also exposed to construction, road expansion, land conversion and changes in farming practices.
The loss of large trees adds another pressure. The source report links urbanisation and tree removal to the shrinking availability of habitat. Even when a bird does not nest in a city centre, the loss of trees along village roads, field boundaries and settlement edges can remove resting, hunting and breeding sites. In such landscapes, habitat is not limited to a protected forest. It includes the everyday network of trees, open ground and cultivated areas that allows wildlife to move and feed.
The disappearance of familiar birds therefore provides a ground-level measure of how urbanisation is spreading. Planning decisions often record land parcels, buildings and roads, but they may not capture the ecological functions of trees and open fields. A tree removed for a road widening or a construction site can appear as a small local change in an official file while forming part of a much larger pattern of habitat fragmentation.
## The unresolved mobile-tower question
The report also points to mobile towers and electromagnetic radiation as a possible factor. Researchers working with birds have, according to the source, suggested that exposure to electromagnetic fields may affect reproductive capacity and egg hatching. It further refers to studies of sparrows in different parts of India that examined the relationship between the growth of mobile towers and declining bird numbers.
These claims require careful handling because the source itself presents them as preliminary. It does not provide the methodology, sample size, locations, exposure levels or findings of a specific study on Indian rollers. Nor does it establish that mobile towers are the principal cause of the decline in Bengal. The available material supports treating the issue as a research question, not as a settled explanation.
That distinction is especially important in urban reporting. New infrastructure often becomes the most visible explanation for an ecological change, even when several pressures operate simultaneously. For the Indian roller, the reported loss of insects, reduced tree cover and changing agricultural landscapes may be as important as, or interact with, the expansion of telecommunications infrastructure. Without species-specific monitoring, it is not possible to assign a precise share of responsibility to any one factor.
The institutional challenge is therefore to move from general observation to targeted evidence. Monitoring would need to examine where Indian rollers are still being seen, whether breeding sites have reduced, how insect availability has changed, what pesticide practices are present, and whether sightings correlate with tree cover, agricultural intensity or tower locations. The source material does not indicate that such a comprehensive assessment has yet been completed.
## What forest authorities can and cannot establish
The Purulia divisional forest officer, Anjan Guha, said that bird numbers are declining for several reasons, including the Indian roller, and that the department is taking steps based on observations and reports. This indicates that the forest department is aware of the pattern, but an administrative response based on observations is different from a formal population assessment.
The distinction affects policy. Wildlife rules can prevent the capture and ceremonial release of birds, as has happened with the Vijayadashami practice. They can also support enforcement against illegal trade or handling. But regulations alone cannot restore insect-rich agricultural fields, replace mature trees or recreate connected habitats across expanding settlements.
Those responsibilities are spread across several institutions. Forest departments oversee wildlife protection, while agricultural agencies influence pesticide practices. Municipal bodies and panchayats shape tree removal, land conversion and local development. Telecommunications authorities and service providers control the expansion and operation of mobile infrastructure. The decline of a common bird sits at the intersection of these systems, which is why it can remain visible without producing a single clear administrative answer.
The reference to other declining birds, including sparrows, hornbills and greater adjutants, reinforces that the Indian roller may be part of a broader regional pattern. However, the source does not provide comparable population figures for those species. Their inclusion is best understood as a warning about wider biodiversity pressure rather than as proof that all are declining for identical reasons.
## The larger urban question
The Indian roller’s decline raises a basic question for Bengal’s urban expansion: what counts as habitat in a developing settlement? If ecological planning focuses only on protected forests, it will miss the farmland, trees, open plots and roadside corridors that support species living near people. If infrastructure planning treats trees and insect-rich landscapes as expendable, the effects may appear first as reduced bird sightings but extend through the wider food web.
The story also demonstrates why cultural familiarity can be a form of environmental evidence. A bird remembered through religious practice and seasonal observation is easier for communities to notice when it becomes scarce. Such observations cannot replace scientific surveys, but they can help identify where formal monitoring is needed.
What the available evidence confirms is a substantial reported decline in Indian roller sightings in parts of West Bengal, a reduction observed over more than a decade and acknowledged by local forest authorities. What remains uncertain is the exact population change, the relative contribution of pesticides, habitat loss and mobile infrastructure, and the species’ current breeding condition. Those unanswered questions should determine the next stage of research and conservation rather than allowing any single preliminary explanation to become established fact.
