Himalayan Monal Forced to Alter Its Call and Climb Higher as Human Activity Squeezes Its Mountain Home

A striking pheasant found in the mountain forests of the Himalayas is being forced to change both where it lives and how it communicates, according to two new studies by Indian researchers that together paint a troubling picture of a fragile ecosystem under pressure.

The Himalayan monal, known for the male's iridescent plumage of green, blue and copper, occupies a special place in the culture and folklore of the region. It serves as the state bird of Uttarakhand in India and the national bird of Nepal, a reflection of its symbolic importance across the Himalayan range. But the research suggests that this cultural icon is now struggling to adapt to a rapidly changing landscape.

The two studies, carried out over a five-year period by researchers based in Uttarakhand, identified distinct but connected threats. One found that the birds are being pushed to higher elevations as their natural habitat in the alpine meadows above the tree line becomes increasingly crowded. The other documented a shift in the pitch of the monal's calls, apparently an attempt to be heard over the noise generated by human activity in a busy valley.

Dr Rajeev Lochan, who led both studies, explained that the monal was chosen as a subject precisely because of its narrow habitat range. The bird moves seasonally between the lower montane zone on the mountain slopes and the high-elevation alpine zones, a pattern that makes it a useful indicator of overall ecosystem health in the north-western Himalayas. If the monal is struggling in this landscape, Lochan said, there is a real possibility that other bird species are also being affected by ecological disturbances.

The implications extend well beyond a single species. Vishal Singh, an environmental practitioner who works on ecology and climate issues in the Himalayas, described the findings as a warning sign. He noted that if a relatively adaptable bird like the monal is compelled to change both its voice and its address, the outlook for more sensitive species could be far worse. The monal, in this sense, functions as a stand-in for the health of an entire fragile mountain ecosystem that is being pushed toward a tipping point by unregulated tourism and heavy urbanisation.

The region has long attracted tourists, trekkers and researchers because of its dramatic scenery and rich biodiversity. However, the pace of infrastructure expansion over the past decade has opened up previously remote areas, increasing the number of visitors and disrupting wildlife in the process. These mounting human pressures come on top of a growing body of evidence that climate change is emerging as another major threat to the region's already vulnerable biodiversity.

According to the first study, climate change is projected to continue shrinking and destabilising the monal's habitat across the Indian Himalayas through the year 2100 under multiple climate scenarios. The birds are currently found in alpine meadows situated high above the forests, which rank among the Himalayas' most important seasonal grazing grounds and biodiversity-rich habitats.

To reach these conclusions, the researchers modelled how climate change could shift the monal's suitable habitat across the Indian Himalayan region, focusing on the states of Uttarakhand and Himachal Pradesh. Their work drew on the global climate models and emissions scenarios used for assessments by the Intergovernmental Panel on Climate Change, the United Nations' climate science body. The modelling assumes that the bird will continue to need the climate conditions currently found in alpine meadows, a reasonable but not guaranteed premise.

Lochan said the birds are already slowly moving upwards as snow melts and vegetation grows, making higher areas accessible to them. At the same time, they are being pushed upwards because their natural habitat in the alpine meadows is being encroached upon by human activity. The combination of these forces leaves the monal with progressively less room to manoeuvre.

The study warns that the bird's seasonal migration may become increasingly difficult as climate change forces it to move to higher elevations, into smaller and more fragmented areas. Under such conditions, populations would be scattered in disconnected pockets, reducing the chances of breeding between different groups and raising the risk of long-term decline or even local extinction. The researchers note that this is already a threat.

The second study, conducted by Lochan along with Dinesh Kumar Sharma and Anand Kumar of Hemvati Nandan Bahuguna Garhwal University, focused on behavioural changes in the bird. The fieldwork took place in two valleys within the Kedarnath Musk Deer Sanctuary in Uttarakhand, including Chopta, a tourist destination with busy traffic.

The findings from that research point to the monal altering its pitch to cut through the human noise in the valley, a shift that affects how the bird communicates with potential mates and rivals. Such changes matter because vocal communication is central to courtship and to establishing dominance, and any disruption could have consequences for breeding success.

Taken together, the two studies suggest that the pressures on the monal are operating on multiple fronts at once. Habitat loss is pushing the bird upwards, while noise pollution is changing the way it signals to others of its kind. The researchers argue that these twin effects make the monal a valuable early indicator of ecological stress in the Himalayas.

Singh framed the broader problem in terms of priorities, saying that while many factors are at play, the fundamental issue is that economic development in the region is not aligned with its ecological integrity. The warning carries particular weight given that the Himalayas are already known to be warming faster than many other parts of the world, with consequences for water supplies, agriculture and the millions of people who depend on the mountain range.

For now, the monal remains a familiar and beloved presence in the high meadows of the Himalayas. But the research suggests that its ability to adapt is being tested in ways that could eventually reshape where it lives, how it finds a mate and whether its scattered populations can endure.