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Picture a bird that weighs less than a coin in your pocket and could perch comfortably on the tip of your finger. The smallest bird in the world is real, and it is every bit as astonishing as it sounds.
The title belongs to the bee hummingbird of Cuba, a feathered jewel that tips the scales at under two grams. But it is far from the only record holder. From the high mountains of Mexico to the eucalyptus forests of Australia, a select group of birds pushes the limits of how small a warm-blooded creature can be.
In this guide, you will meet the ten smallest birds on Earth, ranked by weight, with exact measurements, ranges, and the record each one holds. You will also learn why hummingbirds can be so impossibly tiny, and how to picture their size with everyday objects. Let us count them down.
The Quick Answer: The Bee Hummingbird
If you only remember one name, make it the bee hummingbird, or Mellisuga helenae. This Cuban endemic is the smallest known bird on the planet, and no other species comes close to its combination of tiny length and featherlight weight.
Adult males average just 5.5 cm long and 1.95 grams in weight. Females are slightly larger, at 6.1 cm and 2.6 grams. To put that in perspective, a male bee hummingbird is lighter than a US penny, which weighs 2.5 grams. Cubans call it the zunzuncito, which roughly translates as “little hummer”, and observers say it is more often mistaken for a large bee than for a bird.
The male is a miniature showpiece. He wears an iridescent scarlet gorget, or throat patch, with elongated side plumes, a green crown, and bluish upperparts. The female is subtler, bluish green above with a pale grey underside. Both look rounded and plump compared with the slender profile of most hummingbirds, which only makes them more endearing.
Their daily lives run at a frantic pace. A bee hummingbird may visit up to 1,500 flowers in a single day and consumes up to half its body weight in nectar and insects. The female builds a cup nest only about 2.5 cm across, roughly an inch, and lays two eggs that are each about the size of a coffee bean. Few nests in the bird world are harder to spot.
The species is found across the Cuban archipelago, from the mogote hills of Pinar del Rio to the Zapata Swamp and eastern Cuba. Sadly, it is classified as Near Threatened, because deforestation and the spread of crops keep shrinking its habitat. You can read more about its measurements and status on Wikipedia’s bee hummingbird page, and for such a tiny bird it can live a surprisingly long life, up to seven years in the wild.
How Small Is Small? Size Comparisons You Can Picture
Grams and centimetres are abstract. These everyday comparisons make the scale of the smallest birds feel real.
- Penny test: A male bee hummingbird weighs less than a single US penny.
- Postage stamp: The bird’s tiny cup nest, about 2.5 cm across, would fit on a large postage stamp.
- Coffee beans: A bee hummingbird egg is roughly the size and shape of a coffee bean.
- Fingertip: A perched bee hummingbird barely covers the tip of an adult index finger.
- Paperclips: A standard paperclip weighs about one gram, so the smallest bird equals roughly two paperclips.
- Thumb joint: A bumblebee hummingbird is barely longer than the top joint of your thumb.
The 10 Smallest Birds in the World, Ranked
Below is the definitive countdown, ordered by weight from lightest to heaviest. Each entry includes the species, its measurements, its range, and the record it holds. A comparison table at the end lets you scan the whole list at a glance.
1. Bee Hummingbird (Mellisuga helenae)
The undisputed champion. At an average male weight of 1.95 grams and a length of 5.5 cm, the bee hummingbird is the smallest bird, the smallest warm-blooded vertebrate, and, since birds are living dinosaurs, has even been called the smallest known dinosaur. It lives only in Cuba, feeds on nectar and small insects, and survives the night by dropping into torpor to conserve energy.
2. Vervain Hummingbird (Mellisuga minima)
The bee hummingbird’s closest relative is its nearest rival. The vervain hummingbird measures about 6 cm long and weighs just 2 to 2.4 grams, and ornithologists describe it as perhaps the second-smallest bird in the world. It lives on Jamaica and Hispaniola, the islands neighbouring Cuba.
It has one trait no other hummingbird shares: the male has no iridescent feathering at all, just dull metallic green and grey. The female lays two eggs that rank among the smallest of any bird, averaging about 1 cm long and 0.38 grams. She builds a tiny cup nest of plant down and spiderweb, usually within a metre of the ground.
3. Bumblebee Hummingbird (Selasphorus heloisa)
Mexico’s mountain ranges hold the third contender. The bumblebee hummingbird is 5.9 to 7.5 cm long and weighs 2 to 2.7 grams, making it one of the smallest hummingbirds on Earth. It lives in pine-oak forest, cloud forest, and humid scrub between 1,500 and 3,000 metres in elevation.
Males flash a magenta-purple gorget, and both sexes show a small white spot behind the eye. Although it is a Mexican endemic, one individual has been recorded as a vagrant in the Huachuca Mountains of southeastern Arizona. Its wings produce an insect-like buzz in flight, which is how it earned its name.
4. Calliope Hummingbird (Selasphorus calliope)
This is the tiny bird most US readers have the best chance of seeing. The calliope hummingbird measures 7 to 10 cm and weighs 2 to 3 grams, and it is the smallest bird native to the United States and Canada. It breeds in high mountain meadows of the Northwest and winters in Mexico.
What makes the calliope truly remarkable is its journey. It completes migrations of some 9,000 km twice a year, which makes it the smallest long-distance migrant in the bird world. Think about that: a bird weighing less than a nickel flies the equivalent of New York to London and back, every single year. The Cornell Lab of Ornithology’s calliope hummingbird profile describes its U-shaped courtship dives and its magenta throat rays in detail.
5. Short-Tailed Pygmy Tyrant (Myiornis ecaudatus)
Not every record holder is a hummingbird. The short-tailed pygmy tyrant, at 6 to 7 cm and about 4.2 grams, is the smallest passerine, or perching bird, on Earth. It lives in the Amazon Basin and on Trinidad, where it hunts insects in the forest canopy.
Its tail is so short that the bird looks almost tailless in flight, and field guides warn that it is more likely to be mistaken for a large beetle than for another bird. It builds a domed bag nest with a side entrance, hangs it from a branch, and lays two spotted eggs. For a bird this small, its “spectacled” face, a white eye-ring above dark lores, is surprisingly bold.
6. Goldcrest (Regulus regulus)
Europe has its own miniature champion. The goldcrest is the smallest European bird, measuring 8.5 to 9.5 cm and weighing 4.5 to 7 grams. Its range covers much of the Palearctic, from the British Isles across Asia to Japan.
The name means “little king”, and it wears its crown well: males flash an orange-centred yellow crest, females a plain yellow one. Goldcrests are restless insect hunters, constantly flicking through conifer foliage, and in winter they often join mixed flocks of tits. A goldcrest weighs about the same as a sheet of paper, yet it survives northern winters that kill far hardier creatures.
7. Cuban Tody (Todus multicolor)
Cuba holds two spots on this list. The Cuban tody is 11 cm long and weighs 5.9 grams, with a comically large head, a thin flat bill, an iridescent green back, a red throat, pink flanks, and a blue ear patch. It looks like a jewel that learned to fly.
Unlike the hummingbirds above it, the tody does not hover for nectar. It sallies out from a perch to snatch insects, and it nests in a tunnel about 30 cm long dug into a clay bank or rotten trunk, which both parents help excavate. Its most characteristic call is a soft rolling “pprreeee”, the origin of its Cuban nickname.
8. Weebill (Smicrornis brevirostris)
Australia’s smallest bird is the weebill, at 8 to 9 cm long and an average weight of 6 grams. Its very name tells you its size: Smicrornis comes from Greek words meaning “small bird”. It lives across most of mainland Australia, favouring the canopies of dry eucalyptus woodlands.
Weebills are busy, noisy little foragers that glean insects and spiders from outer foliage, often hanging upside down from twigs. They are sociable, feeding in pairs or small parties and mixing with thornbills and pardalotes. Their dome-shaped pendant nests hang from branches hidden in dense canopy foliage, and the female lays two to four speckled eggs.
9. Elf Owl (Micrathene whitneyi)
The list takes a leap in size here, but the elf owl earns its place as the world’s smallest owl. It measures 12.5 to 14.5 cm and averages just 40 grams, about the weight of a golf ball. It lives in the southwestern United States, Baja California, and Mexico.
Elf owls nest in abandoned woodpecker holes in giant saguaro cacti and other trees, and they hunt insects, scorpions, and spiders at night. When handled, they famously feign death, going limp so a predator relaxes its grip, then escaping. A sparrow-sized owl that plays dead is one of the desert’s great characters.
10. Black-Thighed Falconet (Microhierax fringillarius)
The final record holder proves that small does not mean harmless. The black-thighed falconet is the smallest bird of prey in the world, with a wingspan of 27 to 32 cm, roughly the size of a house sparrow. It hunts insects and small birds in the forests of Southeast Asia.
Like all falconets, it is a fierce little predator, taking prey with the hooked bill and talons of a bird many times its size. It is a fitting end to the countdown: the smallest raptor on Earth is still very much a raptor.
Comparison Table: The 10 Smallest Birds at a Glance
| Rank | Species | Length | Weight | Range |
|---|---|---|---|---|
| 1 | Bee hummingbird | 5.5-6.1 cm | 1.95-2.6 g | Cuba |
| 2 | Vervain hummingbird | ~6 cm | 2-2.4 g | Jamaica, Hispaniola |
| 3 | Bumblebee hummingbird | 5.9-7.5 cm | 2-2.7 g | Mexico |
| 4 | Calliope hummingbird | 7-10 cm | 2-3 g | Western North America to Mexico |
| 5 | Short-tailed pygmy tyrant | 6-7 cm | ~4.2 g | Amazon Basin, Trinidad |
| 6 | Goldcrest | 8.5-9.5 cm | 4.5-7 g | Europe and Asia |
| 7 | Cuban tody | 11 cm | 5.9 g | Cuba |
| 8 | Weebill | 8-9 cm | ~6 g | Mainland Australia |
| 9 | Elf owl | 12.5-14.5 cm | ~40 g | Southwestern US, Mexico |
| 10 | Black-thighed falconet | Wingspan 27-32 cm | Sparrow-sized | Southeast Asia |
Why Can Hummingbirds Be So Tiny?
Hummingbirds dominate the top of this list, and that is no accident. Their bodies are precision machines built around one extraordinary ability: sustained hovering flight. Their flight muscles make up 22 to 34 percent of their total body weight, their shoulder joints let the wings rotate a full 180 degrees, and each wing traces a figure-eight pattern that generates lift on both the upstroke and the downstroke. No other bird family can fly backwards, upside down, or stop dead in midair the way they do.
That flight comes at a brutal energy cost. A bee hummingbird’s metabolism runs so fast that it must eat up to half its body weight every day, which is why a single bird can drain 1,500 flowers before dusk. Nectar is the fuel, and if you have ever wondered how birds drink water and take in liquids, hummingbirds do it with a long, forked tongue that flicks in and out of the bill at remarkable speed.
The night is the real danger. A bird this small loses heat fast, so hummingbirds enter torpor after dark, dropping their body temperature from around 41 C to roughly 30 C to conserve energy until morning. It is a nightly near-shutdown of the body’s systems, and it is one of the secrets that lets a two-gram animal survive at all. The Animal Diversity Web’s bee hummingbird account has a fuller description of this daily cycle.
And yet these featherweight birds are not fragile in every sense. A bee hummingbird can live up to seven years in the wild, which is a remarkable span for something lighter than a coin. If you want the details on lifespans across the family, see our guide on how long hummingbirds live.
How Scientists Actually Measure “Smallest”
You may notice that “smallest” is doing some quiet work in this article. Ornithologists usually rank birds by weight, because weight best reflects the animal’s overall mass and energy needs. The bee hummingbird wins on both weight and length, so the top spot is not controversial.
Further down the list, though, the ranking can shift with the metric. The short-tailed pygmy tyrant is shorter than the goldcrest but heavier than some individuals of it. The vervain and bumblebee hummingbirds sit within a fraction of a gram of each other, so their exact order depends on which specimens were measured. Treat any “top 10 smallest birds” list as an honest approximation rather than a laboratory-grade ranking.
It is also worth knowing why so many lists disagree. Some count only adults, some mix in juvenile measurements, and a few careless articles rank by length alone, which would crown a different set of birds entirely. When you see a claim about the smallest bird, check whether the source gives both length and weight, and whether it names the sex measured. Males and females often differ, as the bee hummingbird’s 1.95-gram males and 2.6-gram females show.
Frequently Asked Questions
How much does the smallest bird in the world weigh?
The bee hummingbird, the smallest bird in the world, weighs an average of 1.95 grams for males and 2.6 grams for females. That is lighter than a US penny, and roughly the weight of two standard paperclips.
Are bee hummingbirds endangered?
They are classified as Near Threatened by the IUCN and listed under CITES Appendix II. Their population is fragmented across Cuba, and the main threat is habitat loss as forests are cleared for crops. They are not yet endangered, but their limited range makes them vulnerable.
Can you see a bee hummingbird outside Cuba?
Essentially, no. The bee hummingbird is endemic to the Cuban archipelago, including the Isla de la Juventud. There have been a few reported sightings on nearby Jamaica and Haiti, but no established populations. If you are birding in the United States, the smallest bird you can see is the calliope hummingbird, number four on this list.
Do very small birds migrate?
Yes, and the distances are staggering. The calliope hummingbird, weighing just 2 to 3 grams, migrates some 9,000 km each way between its breeding grounds in the northwestern mountains and its wintering grounds in Mexico. It is the smallest long-distance migrant in the bird world.
What do baby hummingbirds eat?
Hummingbird chicks are fed by regurgitation: the mother delivers a mix of nectar and small insects or spiders directly into their bills. The insects provide the protein growing chicks need, which nectar alone cannot supply. For the full breakdown, see our guide on what baby hummingbirds eat.
Conclusion
The bee hummingbird keeps its crown: at under two grams, it is the smallest bird in the world, the smallest warm-blooded vertebrate, and a marvel of engineering that visits 1,500 flowers a day on wings that blur too fast to see. But the rest of the countdown shows that extreme smallness has evolved again and again, in hummingbirds, tyrant flycatchers, kinglets, todies, warblers, owls, and even falcons.
The deeper lesson is that tiny is not the same as fragile. These birds survive freezing mountain nights, cross continents on paperclip-light wings, and outmanoeuvre predators many times their size. Their size is a superpower, won through torpor, blazing metabolisms, and flight muscles that would shame an athlete.
Next time you are in the garden, look closely at the smallest visitor at the feeder. Somewhere in its lineage is a two-gram champion from Cuba, and the story of how birds got that small is still one of nature’s best. Keep exploring the backyard birding guides on BirdsBuzz, and you will never look at a tiny bird the same way again.
