In a striking discovery from Northeast India, scientists have documented—for the first time—a resident, breeding population of barn swallows in Manipur’s Imphal Valley, challenging the long-held belief that the species visits the region only seasonally.
The study, led by Amarjeet Kaur and Dr R. Suresh Kumar of the Wildlife Institute of India, suggests that these migratory birds may have quietly abandoned migration in this part of the country.
“This study provides the first documentation of a resident breeding population of barn swallows in Manipur,” the researchers note, adding that the finding “extends the known breeding range of the species in the Indian subcontinent.”
Barn swallows (Hirundo rustica) are among the world’s most widespread migratory birds, typically breeding in the northern hemisphere and travelling thousands of kilometres with the seasons.
However, field surveys conducted across Manipur in 2022–23 revealed swallows nesting, breeding, and remaining in the Imphal Valley throughout the year.
“We identified the population as year-round residents based on the continued presence of adults at nesting sites during both the breeding and non-breeding seasons, and their identity was based on colour ringing,” the authors state.
The team recorded nests across nearly 50 properties and captured 45 individuals, confirming active breeding and strong site fidelity—an unusual pattern for a species known for long-distance migration.
Dr R. Suresh Kumar said the finding adds a new dimension to bird ecology research in India. “The Barn Swallow, previously known as the Common Swallow, has been extensively studied in America and Europe, while research in Asia has been relatively recent. In India, this is among the first ecological studies. While we have been studying these summer migrants to the Himalayas over the past three years, the story of the Imphal swallow being resident is an interesting finding, indicating potential climatic influences on their residency,” he said.
The researchers suggest that this behavioural shift may be linked to broader climatic and ecological processes. Changes in habitat, along with climate variability, may have enabled the species to settle permanently in the valley.
Notably, the Imphal Valley retains extensive agricultural landscapes, likely providing a steady supply of aerial insects that sustain the population year-round.
“A shift in migratory behaviour… may have resulted in populations becoming sedentary,” the study notes, pointing to similar patterns observed globally.
Amarjeet Kaur said the finding could signal a wider ecological transition. “Finding a long-distance migratory species choosing to stay year-round in Manipur highlights a critical shift in species response to season and habitat. We must now investigate how the Imphal Valley is sustaining these populations of aerial insectivores, their dependency on human-made structures, and whether they are evolutionarily distinct from their Himalayan counterparts,” she said. “We are looking at a population that is rewriting its own natural history.”
Interestingly, the Imphal population does not align neatly with any known subspecies. Their body measurements overlap with multiple subspecies, while plumage traits resemble both Siberian and American forms, suggesting either hybrid origins or a complex evolutionary history.
“This highlights unresolved questions regarding subspecies limits and breeding range dynamics in the eastern part of the subcontinent,” the study notes.
Beyond ecology, the bird holds a deep cultural presence in Manipur. Locally known as “Sambrang,” barn swallows have long been part of everyday life. In Nongdam by Moirangthem Rajendra Singha, a chapter titled “Feathered Guests” describes swallows roosting in interior hallways during winter, reflecting a long-standing coexistence between people and the species. In Meitei belief, the birds are associated with prosperity and linked to Goddess Lakshmi, leading to widespread protection of nests in homes and buildings—conditions that may be supporting their shift to a resident population.
The findings raise broader questions about how migratory species respond to climate change, human landscapes, and ecological pressures—particularly in under-studied regions like Northeast India.
“Whether the Manipur population is demographically or genetically connected to migratory populations remains unresolved and warrants further investigation,” the researchers caution.
For now, the study points to a striking possibility: a bird known for epic seasonal journeys may have found a permanent home in the Imphal Valley, reshaping our understanding of migration itself.
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