Can Birds Smell? The Surprising Science of a Bird’s Sense of Smell
As human beings, we can smell thousands of odors, the scent of food, flowers, and fruits, perfumes of all kinds, and so on. What about birds? Can birds smell different scents? This blog can help you get an answer to this question.
Quick Answer
Yes, birds can smell. For most of the last century, scientists assumed birds had almost no sense of smell, since the scent-processing region of their brains looked small next to a mammal’s. That assumption has since been overturned. Species like turkey vultures, kiwis, albatrosses, and storm-petrels have a genuinely strong sense of smell and depend on it to find food, navigate, and locate nests or mates over long distances.
For Most of the 20th Century, Scientists Assumed Birds Couldn’t Smell
For decades, the conventional wisdom in ornithology held that birds navigated their world almost entirely through sight and sound, with smell playing little to no role. This idea traced back to comparative anatomy: a bird’s olfactory bulb — the brain structure that processes scent — looked tiny next to the same structure in a mammal, so researchers assumed it didn’t do much.
Early behavioral studies seemed to confirm the theory. In one frequently cited example, naturalist John James Audubon ran an experiment on turkey vultures in the 1820s and concluded the birds locate carrion by sight rather than scent, since they didn’t respond to meat he hid from view. That conclusion went largely unchallenged for close to two centuries.
The turning point came in the mid-20th century, when biologists testing turkey vultures with gas-pipeline leak-detection equipment found the birds reliably zeroing in on ethyl mercaptan — a compound added to natural gas specifically because it smells like rotting meat. Since then, genetic studies, brain-mapping research, and field experiments have built a far more detailed picture.
Researchers at Germany’s Max Planck Institute for Ornithology compared the olfactory receptor genes of nine bird species and found striking differences between them: the brown kiwi, a nocturnal forager, carries roughly six times as many scent-receptor genes as a blue tit or canary — a gap that lines up closely with how much each species actually relies on smell in the wild.
Which Birds Actually Have a Strong Sense of Smell?
A handful of bird families turn out to be genuine smelling specialists. Here’s what the research shows about each.
Turkey Vultures
Turkey vultures can detect the faint, diluted scent of decay drifting hundreds of feet above the ground, then circle downwind until they pinpoint its source — a hunting strategy closer to a tracking dog’s than to most birds’. That ability helps explain why turkey vultures have one of the widest ranges of any vulture species worldwide: they can find carrion hidden under dense forest canopy that purely sight-hunting vultures would miss entirely.
Storm-Petrels, Albatrosses, and Petrels
Out on the open ocean, where there’s nothing to see for miles in any direction, smell becomes the most useful long-range sense available. Storm-petrels — small, far-ranging seabirds — can detect the scent of prey from roughly 25 kilometers (about 15 miles) away.
Albatrosses and petrels use a related trick: they track dimethyl sulfide, a gas released into the air when tiny marine crustaceans graze on phytoplankton. Because that gas concentrates over productive feeding grounds, following its scent leads these birds straight to schools of fish and squid.
Kiwis
New Zealand’s kiwis are one of the only birds with nostrils at the very tip of the bill rather than at the base, which lets them sniff out earthworms and other invertebrates buried in soil — a useful adaptation for a flightless, largely nocturnal forager.
How Do Backyard Birds Compare?
Compared with ocean wanderers and carrion specialists, the birds at a typical feeder have a far more modest sense of smell. The table below summarizes where some familiar species fall on the spectrum.
| Bird | Sense of Smell | What It’s Used For | Source |
|---|---|---|---|
| Turkey Vulture | Strong | Locating carrion from the air, even under tree cover | Smithsonian / Cornell Lab |
| Storm-Petrel | Strong | Detecting prey scent from up to 15 miles away | Cornell Lab / BirdNote |
| Albatross & Petrel | Strong | Tracking feeding grounds via gas released by grazed phytoplankton | Cornell Lab / Audubon |
| Kiwi | Strong | Sniffing out buried insects and earthworms | Audubon |
| Black-capped Chickadee | Moderate | Recognizing members of its own species by scent | NSF / Lehigh University |
| American Crow | Moderate | Possibly locating carrion and food scraps, less studied than in vultures | Cornell Lab |
| American Robin | Weak | Finds earthworms mainly by sight, not smell (see myth check below) | Audubon |
| Hummingbird | Very Weak | Relies almost entirely on sight to locate nectar sources | Cornell Lab |
What Do Birds Actually Use Their Sense of Smell For?
- Foraging: Vultures and petrels use scent to find completely invisible food sources — carrion under a forest canopy, or fish and squid scattered across miles of open ocean.
- Navigation: In field experiments, migratory gray catbirds relied on smell more heavily than on the sun or Earth’s magnetic field to retrace a known migration route. Researchers suspect many songbirds may use scent cues from the landscape to relocate a previous year’s nesting territory, though this remains an active area of study.
- Mate and species recognition: Black-capped chickadees produce scented preen oil with a chemical signature specific to their species. Research from Lehigh University found that chickadees consistently prefer the scent of their own species over that of the closely related Carolina chickadee — a previously unrecognized form of species recognition in songbirds.
- Nest and colony recognition: Burrow- and colony-nesting seabirds, including petrels, use scent to find their own nest among hundreds of nearly identical neighbors.
- Threat detection: Some research suggests certain songbirds can pick up on chemical cues linked to predators or unsafe nest sites, though this function is less well understood than foraging or navigation.
Myth Check: Do Robins Really “Smell Out” Earthworms?
This is one of the most repeated bird-smell claims online — and it doesn’t hold up. A 1965 study concluded that American robins locate earthworms entirely by sight, watching for movement or peering into burrow openings rather than sniffing for them. Later researchers tested whether robins might instead be using hearing, and ran controlled experiments — including some where worms were coated in unpleasant-smelling substances — that found smell wasn’t a meaningful factor either way. The current scientific consensus, as summarized by Audubon, is that robins most likely combine sight and hearing to hunt earthworms, leaning on whichever sense works best in a given patch of lawn, rather than using scent at all.
How Far Can Birds Really Smell?
Among the strong smellers, the detection range can be remarkable. Storm-petrels can pick up prey scent across roughly 25 kilometers of open ocean.
Turkey vultures can detect chemical traces drifting hundreds of feet in the air — a sensitivity discovered almost by accident, when gas companies realized that vultures circling above buried pipelines made a surprisingly effective leak-detection system.
For most backyard species, though, smell’s effective range is closer to a few feet: useful for inspecting a food source up close, but not for locating one from a distance.
What Smells Attract Birds to Your Feeder — and What Doesn’t
Color and visual contrast play the biggest role in how seed-eating birds find a feeder in the first place; smell matters far less here than it does for a vulture or a petrel. Fruit, nectar, and the volatile compounds released by ripening produce can draw in fruit- and nectar-feeding species from a short range, and the smell of fermenting or insect-infested food can attract insectivorous birds nearby.
On the flip side, several strong-smelling substances — capsaicin from chili peppers, peppermint, and citrus oils — are commonly reported to make birds uncomfortable enough to avoid a treated area, though the evidence behind most of these home remedies is more anecdotal than rigorously tested.
If you want to see this play out instead of just reading about it, a Birdfy smart feeder camera makes it easy to watch how birds actually find a new feeder — whether the first visitor arrives because of the seed’s color, another bird’s example, or simple persistence. Live notifications and recorded clips show you exactly which species show up and when, without you needing to stake out the yard yourself.
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Buy NowFAQs
Can hummingbirds smell?
Only weakly. Hummingbirds have olfactory glands, but they rely overwhelmingly on sight — particularly red and orange colors — to locate nectar sources, and there’s no strong evidence that scent plays a major role in how they choose flowers or feeders.
Do crows and ravens have a good sense of smell?
It’s a moderate sense at best, and far less studied than in vultures or seabirds. Crows are highly food-opportunistic and may use smell to help locate carrion or food scraps in some situations, but their foraging success relies mainly on intelligence, memory, and sight.
Will a bird abandon its nest if a human touches it?
Most songbirds have a weak sense of smell and won’t abandon a nest simply because it now carries a human scent. The bigger risk from handling a nest is the disturbance itself — startling the parents away long enough for eggs to chill or for predators to notice the activity.
What smells repel birds from a yard or garden?
Strong, pungent smells like peppermint oil, citrus, vinegar, and capsaicin are widely reported to discourage birds, though most of this evidence comes from pest-control use rather than controlled scientific studies. These scents also fade quickly and tend to work best paired with visual deterrents.
Why did scientists believe birds couldn’t smell for so long?
Early researchers judged smell ability mostly by the size of a bird’s olfactory bulb, which looked small relative to a mammal’s. Genetic and behavioral research over the past few decades has shown that bulb size alone is a poor predictor of olfactory ability and that several species process scent far more effectively than their brain anatomy alone would suggest.
The Bottom Line
Birds' sense of smell turns out to be far more varied — and in a handful of species, far more powerful — than ornithologists assumed for most of the 20th century. Whether you’re watching turkey vultures circle on a thermal or chickadees work through a feeder, scent likely plays some role in what you’re seeing, even when sight is doing most of the work.
