Himalayan Monal Alters Song Amid Rising Human Pressure, Study Finds

Two studies conducted by Indian researchers indicate that increased human activity is significantly altering the behavior and habitat of the Himalayan monal, a colorful pheasant native to the region’s mountain forests.

The monal, recognized as the state bird of Uttarakhand and the national bird of Nepal, is experiencing pressure from infrastructure development and tourism. Findings show the birds are being forced to migrate to higher elevations as their natural alpine meadow habitats become crowded, while rising noise levels are changing how they communicate with mates and rivals.

Dr. Rajeev Lochan, the lead researcher for both studies at Hemvati Nandan Bahuguna Garhwal University, described the monal as a key indicator of ecosystem health in the north-western Himalayas due to its narrow habitat range. “If the species is facing issues on this particular landscape, there might be a chance that the ecological disturbances are affecting other birds too,” Lochan told the BBC.

The first study, spanning five years, utilized climate models based on Intergovernmental Panel on Climate Change (IPCC) scenarios to project habitat changes through 2100. Researchers found that climate change is shrinking and destabilizing the monal’s range across Uttarakhand and Himachal Pradesh. As snow melts and vegetation grows, the birds are moving upward, but their seasonal migration paths may become fragmented, reducing breeding opportunities and increasing extinction risks.

The second study focused on behavioral adaptations in vocalizations. Conducted in the Kedarnath Musk Deer Sanctuary, researchers recorded over 700 monal calls in two locations: Chopta, a busy tourist area, and Madmaheshwar, a quieter valley. The data revealed that monals in noisy environments produced calls with significantly higher peak frequencies and shorter durations to cut through low-frequency traffic and human noise.

Lochan emphasized that these changes reflect behavioral flexibility rather than permanent evolutionary shifts. However, Anjal Prakash, a public policy professor at FLAME University, noted the broader implications: “When a species must raise its pitch to be heard over tourist traffic, or climb higher as meadows turn crowded, it reveals how human pressure is rewriting the rules of life in the Himalaya.”

Vishal Singh, an environmental practitioner, warned that if the monal is struggling to adapt both its voice and its habitat, more vulnerable species may be at greater risk. The research underscores a misalignment between economic development and ecological integrity in the region, signaling wider environmental stress across the Himalayas.