Few birds live up to their name as perfectly as the Bumblebee Hummingbird. Barely larger than a large insect, this remarkable hummingbird can hover among mountain flowers while its rapidly moving wings create a distinct buzzing sound.
The Bumblebee Hummingbird (Selasphorus heloisa) is one of the smallest birds in the world. Measuring only about 7 to 7.5 centimeters (2.8 to 3 inches) long and weighing roughly 2.2 grams (0.08 ounces), it can be surprisingly easy to overlook despite the brilliant colors displayed by adult males.
Unlike many hummingbirds familiar to birdwatchers in the United States and Canada, the Bumblebee Hummingbird is essentially a Mexican mountain specialist. Its normal range lies in the highlands of Mexico, where it inhabits pine-oak forests, cloud forests, forest edges, and humid mountain scrub.
Its combination of minute size, shimmering plumage, insect-like flight sounds, and secretive mountain habitat makes the Bumblebee Hummingbird one of Mexico’s most fascinating native birds.
⚡ Bumblebee Hummingbird Fast Facts
| Fact | Details |
|---|---|
| Common Name | Bumblebee Hummingbird |
| Scientific Name | Selasphorus heloisa |
| Former Scientific Name | Atthis heloisa |
| Family | Trochilidae |
| Length | About 7–7.5 cm (2.8–3 in) |
| Weight | About 2.2 g (0.08 oz) |
| Native Range | Mexico |
| U.S. Status | Exceptional historical vagrant in southeastern Arizona |
| Typical Elevation | About 1,500–3,000 m (4,900–9,800 ft) |
| Habitat | Pine-oak forest, evergreen forest, cloud forest, humid scrub, forest edges and clearings |
| Diet | Nectar and small arthropods |
| Conservation Status | Least Concern |
| Population Trend | Considered stable |
| Number of Subspecies | 2 |
🔬 Scientific Classification
| Classification | Bumblebee Hummingbird |
|---|---|
| Kingdom | Animalia |
| Phylum | Chordata |
| Class | Aves |
| Order | Apodiformes |
| Family | Trochilidae |
| Genus | Selasphorus |
| Species | Selasphorus heloisa |
Older bird guides and scientific literature may list the species as Atthis heloisa. Modern classifications used by major ornithological authorities place the Bumblebee Hummingbird in the genus Selasphorus.
This places it alongside other small hummingbirds such as the Rufous Hummingbird, Allen’s Hummingbird, Calliope Hummingbird, and Broad-tailed Hummingbird.
Two subspecies are generally recognized: Selasphorus heloisa heloisa and Selasphorus heloisa margarethae.
🐦 What Does a Bumblebee Hummingbird Look Like?
The Bumblebee Hummingbird’s tiny proportions are often the first thing observers notice. Even by hummingbird standards, it is exceptionally small.
Adult males are the showier sex. They have greenish upperparts and a spectacular iridescent gorget that can flash shades of rose, magenta, purple, and violet depending on the angle of the light. Pale underparts contrast with warmer cinnamon or buff tones along the sides.
The throat feathers can spread outward during courtship, dramatically increasing the apparent size and brilliance of the gorget.
Females are more subdued. They lack the male’s brilliant magenta throat and instead have a pale throat marked with metallic bronze spotting. Their underparts are whitish to grayish, while the flanks may show cinnamon coloration.
Both sexes have relatively short, slender bills and compact bodies.
Their tails contain combinations of dark, rufous, and pale markings that can provide additional identification clues when seen well.
📏 Just How Small Is a Bumblebee Hummingbird?
At approximately 7 to 7.5 centimeters long, the Bumblebee Hummingbird ranks among the smallest birds on Earth.
A typical bird weighs only about 2.2 grams.
That means several Bumblebee Hummingbirds together could weigh less than a single U.S. quarter.
Its exceptionally small size has even caused the species to be mistaken for insects when darting among flowers.
The name is particularly appropriate when a male is flying nearby. Its wings can produce an audible insect-like buzzing noise, especially during courtship displays.
🌎 Where Do Bumblebee Hummingbirds Live?
The Bumblebee Hummingbird’s regular range is concentrated in the mountainous regions of Mexico.
It occurs through portions of both major Sierra Madre mountain systems as well as other highlands of central and southern Mexico.
The nominate subspecies, S. h. heloisa, occurs through northeastern, central, and southern Mexican highlands, including areas extending from Tamaulipas south toward Guerrero and Oaxaca.
The subspecies S. h. margarethae occupies northwestern and western mountain regions, including areas from southwestern Chihuahua and southeastern Sinaloa south toward Jalisco.
The species’ normal breeding distribution is therefore essentially restricted to Mexico.
🇺🇸 Are Bumblebee Hummingbirds Found in the United States?
Technically, yes — but seeing one would be extraordinarily unusual.
Historical specimens establish that Bumblebee Hummingbirds reached the Huachuca Mountains of southeastern Arizona in the late 19th century. Research examining the records supports the origin of those specimens in or near Ramsey and Miller canyons in 1896.
These records make the Bumblebee Hummingbird one of the tiniest birds ever documented in the United States.
However, it should not be considered a regular American hummingbird. Birdwatchers in the United States are vastly more likely to encounter species such as Ruby-throated, Anna’s, Rufous, Black-chinned, Calliope, or Broad-tailed Hummingbirds.
🌲 Bumblebee Hummingbird Habitat
This bird is closely associated with mountain forests.
Bumblebee Hummingbirds typically occur between approximately 1,500 and 3,000 meters (4,900–9,800 feet) above sea level.
Their preferred landscapes include semi-humid and humid pine-oak forest, evergreen forest, cloud forest, humid mountain scrub, forest edges, and brushy clearings.
Forest edges can be particularly useful because sunlight encourages flowering plants to grow while nearby trees provide shelter, perches, and additional feeding opportunities.
There is also evidence that Bumblebee Hummingbirds may make seasonal movements up and down mountain slopes.
Researchers studying the species in Oaxaca suggested that some birds may favor cloud forests during spring and summer while using humid pine-oak forests more extensively during autumn and winter.
Rather than undertaking enormous migrations like some North American hummingbirds, these movements may involve relatively short changes in elevation as flowering conditions change.
🌺 What Do Bumblebee Hummingbirds Eat?
Like other hummingbirds, the Bumblebee Hummingbird depends heavily on flower nectar for energy.
Nectar provides the carbohydrates needed to sustain hovering and extremely active flight.
The species visits a variety of flowering plants and often feeds in the lower and middle levels of vegetation.
Its tiny size can actually be useful around larger hummingbirds. Large species frequently dominate productive flower patches, but a Bumblebee Hummingbird can sometimes slip into feeding areas without triggering the aggressive encounters that occur between more evenly matched rivals.
Nectar is not its only food.
Bumblebee Hummingbirds also consume tiny arthropods, which provide proteins and other nutrients that nectar alone cannot supply.
This combination of nectar and animal prey is typical of hummingbirds.
🌼 Bumblebee Hummingbirds as Pollinators
Every visit to a flower can do more than provide a meal.
As a hummingbird reaches inside a blossom for nectar, pollen may stick to its feathers and bill. When the bird visits another flower, some of that pollen may be transferred.
Hummingbirds can therefore contribute to pollination within the ecosystems they inhabit.
For a mountain species such as the Bumblebee Hummingbird, healthy communities of flowering shrubs, herbs, and forest-edge vegetation provide crucial feeding habitat.
Protecting an intact mountain forest consequently means protecting more than trees. It also preserves the network of flowering plants, insects, birds, and other wildlife that depend upon one another.
💕 Courtship and Breeding
Bumblebee Hummingbird courtship is especially impressive considering the bird’s size.
A displaying male may hover in front of a female while holding his body relatively horizontal and raising his tail. He spreads his brilliantly colored throat feathers toward her and performs repeated vertical movements.
His wings create a conspicuous bee-like buzzing sound during the display.
Researchers studying Bumblebee Hummingbirds in northern Oaxaca observed intense breeding activity during January and February, although other evidence has indicated breeding condition at different times of year.
This suggests that the breeding season may vary geographically or that some populations could potentially breed during more than one period.
Much about the species’ reproductive biology remains poorly understood.
🪺 Bumblebee Hummingbird Nest
One carefully studied Bumblebee Hummingbird nest was a tiny cup constructed primarily from mosses and lichens.
Researchers also observed females carrying other materials, including fibers or hairs from bracken fern and seeds or plant material associated with bromeliads.
The documented nest was placed on a slender branch of an avocado tree approximately 10 meters (33 feet) above the ground.
Females were considerably less conspicuous than males during the breeding study. This secrecy may make nesting Bumblebee Hummingbirds particularly difficult for researchers to locate.
Basic details such as the species’ exact incubation period and typical fledging period remain insufficiently documented.
For such a charismatic little bird, there is still much to discover.
🎵 What Does a Bumblebee Hummingbird Sound Like?
Bumblebee Hummingbirds produce very high, thin vocalizations.
Their song has been characterized as a drawn-out, faint whine, while their calls include short, high-pitched chips similar to those made by related Selasphorus hummingbirds.
The sound of the wings can be just as noticeable as the voice.
Males produce a distinctive buzzing during flight, and that sound becomes particularly prominent during courtship.
In dense mountain vegetation, hearing a tiny buzzing bird may sometimes provide the first clue that a Bumblebee Hummingbird is nearby.
🐝 Bumblebee Hummingbird vs. Bee Hummingbird
Despite their similar names, the Bumblebee Hummingbird and Bee Hummingbird are different species.
The Bumblebee Hummingbird is Selasphorus heloisa and is native to Mexico.
The Bee Hummingbird is Mellisuga helenae and is native to Cuba.
The Cuban Bee Hummingbird holds the title of the smallest living bird in the world, reaching only about 5–6 centimeters in length.
The Bumblebee Hummingbird is somewhat larger, although at roughly 7–7.5 centimeters it is still among the smallest birds on the planet.
Remembering the geography makes the distinction easier: Bumblebee Hummingbird = Mexico; Bee Hummingbird = Cuba.
🛡️ Conservation Status
The Bumblebee Hummingbird is currently classified as Least Concern.
BirdLife International estimates the global population at roughly 50,000–499,999 mature individuals, although the estimate is broad and the underlying population data are limited. The overall population trend is presently considered stable.
Its Least Concern classification does not make its mountain habitat unimportant.
Cloud forests and pine-oak forests support exceptional biodiversity, and maintaining these ecosystems protects not only Bumblebee Hummingbirds but also countless other birds, plants, mammals, insects, and amphibians.
Because this species lives almost entirely within one country and depends heavily on montane environments, continued habitat conservation remains valuable for its long-term future.
💡 Fascinating Bumblebee Hummingbird Facts
One of the most remarkable things about this bird is how many extraordinary traits are packed into such a tiny body. The Bumblebee Hummingbird weighs only about two grams, lives thousands of feet above sea level, can hover beside flowers with remarkable precision, supplements nectar with tiny arthropods, and performs elaborate courtship displays complete with shimmering throat feathers and buzzing wings.
Its older scientific name, Atthis heloisa, also remains common in books, websites, museum records, and scientific literature, so birdwatchers researching the species may encounter both names.
Perhaps most intriguing of all is how much remains unknown. Even fundamental aspects of its breeding cycle are still incompletely documented, making the Bumblebee Hummingbird a reminder that familiar-looking groups such as hummingbirds still contain species with mysteries waiting to be solved.
❓ Bumblebee Hummingbird FAQ
Is the Bumblebee Hummingbird the smallest bird in the world?
No. The world’s smallest living bird is the Bee Hummingbird (Mellisuga helenae) of Cuba. The Bumblebee Hummingbird is slightly larger but is still among the world’s smallest birds.
How big is a Bumblebee Hummingbird?
Adults are approximately 7 to 7.5 centimeters (2.8–3 inches) long and weigh around 2.2 grams.
Where does the Bumblebee Hummingbird live?
Its normal range is in the highlands of Mexico, particularly mountainous areas containing pine-oak forest, evergreen forest, cloud forest, and humid scrub.
Are Bumblebee Hummingbirds found in Arizona?
There are confirmed historic records from southeastern Arizona’s Huachuca Mountains, but the species is an exceptionally rare vagrant rather than a regular resident of the United States.
What do Bumblebee Hummingbirds eat?
They feed primarily on nectar from flowers while also eating tiny arthropods for protein and other nutrients.
Why is it called a Bumblebee Hummingbird?
Its extremely small size and insect-like buzzing wings make the name particularly fitting.
Is Atthis heloisa the same bird?
Yes. Atthis heloisa is an older scientific name that is still frequently encountered. Current major taxonomic treatments generally place the species in Selasphorus as Selasphorus heloisa.
Are Bumblebee Hummingbirds endangered?
No. The species is currently classified as Least Concern, and its global population is considered stable.
🔗 Related Articles
Learn more about these remarkable birds in our Hummingbirds: Species, Identification, Feeding & Backyard Guide.
📚 Sources
- BirdLife International – Bumblebee Hummingbird Species Factsheet — conservation status, population, habitat and elevation information.
- Cornell Lab of Ornithology – eBird/Clements Checklist — current taxonomic treatment placing the Bumblebee Hummingbird in Selasphorus.
- American Ornithological Society – Selasphorus heloisa — North American taxonomic treatment and former placement in Atthis.
- CONABIO Enciclovida – Selasphorus heloisa — Mexican biodiversity and taxonomic information for the species.
- The Wilson Journal of Ornithology – Notes on the Breeding Behavior of the Bumblebee Hummingbird — research on nesting, courtship displays, breeding activity, and possible altitudinal movements.
- Xeno-canto – Bumblebee Hummingbird — recordings and distribution resources for Bumblebee Hummingbird vocalizations.
- PBS Nature – Meet the Smallest Bird on Earth — comparison with Cuba’s Bee Hummingbird, the world’s smallest living bird.
