On a flower-dotted hillside in Amherst, Western Massachusetts, ecologist Olivia Sanderfoot paused to listen. What she heard was a small chorus of birdsong — an Eastern Wood-Pewee, a goldfinch, a downy woodpecker — foraging among the blooms while fluffy fledglings darted about learning the ways of the world. To Sanderfoot, a researcher at Cornell University, the moment felt magical. It is also, increasingly, a moment under threat from an unlikely source: the smoke drifting off wildfires hundreds or even thousands of miles away.
Sanderfoot is one of a small but growing group of scientists pioneering what has come to be called "smoke ecology." The field examines how wildfire smoke disturbs wild places and the animals that live in them — and what might be done to prevent the worst of the harm. While public attention has focused heavily on how smoke affects human health, far less is known about what it does to birds, mammals, insects and entire ecosystems.
The research gap matters because smoke is no longer a rare, localized event. Wildfire seasons have grown longer and more intense, and haze now routinely blankets regions far from the flames themselves. Communities unaccustomed to smoke have found themselves shrouded in it in recent years, a shift that has prompted new questions about the full scope of its consequences.
For birds, smoke may interfere with some of the most basic functions of daily life. Smoke particles can irritate sensitive respiratory systems, and haze can reduce visibility, making it harder to find food, navigate or avoid predators. Smoke also scatters and absorbs light, which could disrupt the cues birds rely on to time migration, foraging and other seasonal behaviors. Sanderfoot's work focuses on understanding precisely how the smoke billowing off wildfires bothers birds — and how that harm might be prevented.
The stakes extend beyond individual species. Birds are embedded in complex food webs as pollinators, seed dispersers and predators of insects. If smoke alters their behavior or survival during critical breeding and migration periods, the effects could ripple through entire ecosystems in ways scientists are only beginning to document.
Previous research has underscored that wildfire smoke is not simply a diluted version of ordinary air pollution. A study published in 2021 found that wildfire smoke can be more harmful to human beings than pollution from cars, a finding that helped fuel public concern about smoke exposure and raised the question of whether wildlife faces similarly outsized risks.
That question is harder to answer than it might appear. Animals cannot report symptoms, and monitoring wildlife during unpredictable smoke events is logistically difficult. Researchers must combine field observations, acoustic monitoring, tracking data and laboratory work to piece together a picture of what smoke does to creatures that cannot tell us how they feel.
Sanderfoot's approach reflects this blend of methods. Standing on that Massachusetts hillside, she uses birdsong as a kind of instrument — a way to measure which species are present, how active they are and whether their behavior shifts when smoke moves in. Such listening surveys can be repeated across smoky and clear days, offering clues about which birds flee, which fall silent and which carry on as usual.
The new field also confronts a practical challenge: much of the harm may be invisible or delayed. Smoke exposure could reduce breeding success, weaken immune defenses or lower body condition without causing immediate, obvious deaths. Those subtler effects are often the ones that matter most for long-term population trends, yet they are the hardest to detect.
Understanding the mechanisms of harm is a first step toward prevention. If scientists can identify when and where smoke poses the greatest risk — during nesting season, for instance, or along migration corridors — land managers and conservationists may be able to act. Possible measures include timing prescribed burns to avoid sensitive periods, protecting or restoring habitats that give wildlife refuge from smoke, and providing cleaner-air shelters in places where animals are concentrated.
Sanderfoot's hillside in Amherst is a reminder of what is at stake. The birds she heard that day — the pewee, the goldfinch, the woodpecker — are not abstractions. They are neighbors in a landscape that is being reshaped by forces originating far beyond it. Fledglings learning the ways of the world may now be learning them under skies their parents never encountered.
Smoke ecology remains a young discipline, with many questions still unanswered. How much smoke is too much for a songbird? Do some species adapt while others decline? Can interventions at key moments make a measurable difference? Each answer will require patient fieldwork, often in conditions that are uncomfortable and unpredictable.
What is already clear is that wildfire smoke is not only a human health story. It is an ecological story, one that unfolds across forests, grasslands and backyards, and one that scientists are only starting to read. Sanderfoot's listening — patient, attentive, reverent — is part of that reading. The birds singing on a flower-freckled hillside may be telling researchers something important, if only the scientists can learn how to hear it.
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