There's a bird weighing about as much as a penny that will, this fall, fly nonstop across 500 miles of open ocean — no rest stops, no islands, just open Gulf of Mexico water the entire way — using nothing but fat reserves it built up in the two weeks before departure. That's the Ruby-throated Hummingbird: the only hummingbird that breeds anywhere in the eastern United States, familiar enough to be the default mental image most Americans have of "a hummingbird," and one of the toughest, most improbable small animals in North America once you look past the flash of red at its throat.

Quick Facts

• Scientific name: Archilochus colubris
• Length: 2.8–3.5 inches (7.5–9 cm)
• Weight: 0.1–0.2 oz (2.8–5.4 g) — adult males average about 3.0 grams, females about 3.5 grams
• Wingspan: approximately 4.3 inches (11 cm)
• Lifespan: typically 3–5 years in the wild; the oldest known banded individual lived at least 9 years, 1 month
• Population: an estimated 35 million as of a 2021 assessment
• Conservation status: Least Concern (IUCN)
• Claim to fame: the only hummingbird species that breeds anywhere east of the Great Plains, and holder of one of the most demanding migratory routes, pound for pound, of any bird in the world

The Origin Story: How the Ruby-throated Hummingbird Got Its Name

The Ruby-throated Hummingbird was formally described for science in 1758 by Carl Linnaeus himself — the Swedish naturalist who created the entire system of binomial nomenclature still used to name species today. In the tenth edition of his landmark work Systema Naturae, Linnaeus classified the species as Trochilus colubris, basing his description on two earlier accounts: naturalist Mark Catesby's The Natural History of Carolina, Florida and the Bahama Islands (1729) and George Edwards's A Natural History of Uncommon Birds (1743). The official type locality — the place tied to the original specimen description — is South Carolina, a detail preserved in Cornell Lab's Birds of the World account for Archilochus colubris.

The species name colubris comes from the Spanish word colibrí, simply meaning "hummingbird." Nearly a century later, in 1854, German naturalist Ludwig Reichenbach moved the species into a new genus, Archilochus, where it remains classified today alongside its closest relative, the Black-chinned Hummingbird. The common name itself is straightforward once you see an adult male in good light: an iridescent, ruby-red throat patch, or gorget, that can look brilliant crimson from one angle and nearly black from another — a hallmark of structural color, produced by the physical structure of the feathers rather than pigment. The U.S. Fish & Wildlife Service species profile uses that same gorget as its primary field mark.

Where the Ruby-throated Hummingbird Lives: The Largest Breeding Range of Any North American Hummingbird

According to Cornell Lab's Birds of the World database, the Ruby-throated Hummingbird occupies the largest breeding range of any hummingbird species in North America — an enormous swath of territory stretching from central Canada down to the Gulf Coast, and from the Atlantic seaboard west to a strikingly straight north-south boundary just east of the 100th meridian, the same line that roughly divides the humid East from the arid West across the central United States. That boundary isn't a coincidence: research published in the Canadian Journal of Zoology has found the breeding range closely tracks the extent of eastern deciduous and mixed boreal forest, the habitat this species is built for.

In winter, most Ruby-throated Hummingbirds relocate to southern Mexico and Central America, as far south as Costa Rica and Panama, with a smaller population remaining year-round in southern Florida and along parts of the Gulf Coast. The University of Michigan's Animal Diversity Web account maps that seasonal split in detail.

How to Identify the Ruby-throated Hummingbird: Males vs. Females

Adult Males

The gorget is the giveaway: a brilliant iridescent ruby-red throat patch, bordered by a thin band of black around the cheek area, that can appear to switch on and off entirely depending on the angle of light — brilliant crimson one moment, nearly black the next. The back and crown are iridescent green, the underparts white to pale gray, and the tail is forked and mostly black with a faint violet sheen. Males are slightly smaller than females and have marginally shorter bills.

Adult Females

No red throat at all — instead, a plain white throat, sometimes lightly marked with faint dusky streaks or small dark stipples. The tail is notched rather than deeply forked, with outer feathers banded in green, black, and white, visible as white-tipped corners in flight. Females are slightly larger than males on average.

Juveniles and Immatures

Young birds of both sexes closely resemble adult females at first — plain or lightly marked white throats and green-backed plumage. Juvenile males typically show heavier throat markings than females, and by late summer, many begin developing a handful of scattered iridescent red feathers in the gorget as it fills in toward its adult appearance.

A Quick Note on Sound

Ruby-throated Hummingbirds produce a wingbeat frequency of roughly 50–53 beats per second in normal flight — the source of the low humming sound that gives the entire family its name — with the rate increasing further during chases and courtship displays. Sharp, metallic chip notes are used during close-range disputes and territorial encounters, along with rapid chattering or squeaky scolding sounds during feeder disputes.

Behavior: Solitary, Territorial, and Endlessly Busy

Ruby-throated Hummingbirds are solitary for virtually their entire lives outside of the brief mating encounter — they migrate alone, feed alone, and (for males) take no part whatsoever in nesting or raising young. Both sexes fiercely defend feeding territories, chasing off rivals, insects, and birds many times their own size from a favored patch of flowers or a feeder. According to Rutgers Cooperative Extension, males will aggressively defend territory not just from other hummingbirds but from other bird species, bees, and wasps alike.

Feeding and Diet

According to Cornell Lab's All About Birds, Ruby-throated Hummingbirds feed on the nectar of red or orange tubular flowers — trumpet creeper, cardinal flower, honeysuckle, jewelweed, bee balm, red buckeye, and red morning glory are all favorites — as well as feeders and, occasionally, tree sap.

Insects and spiders are just as essential to the diet as nectar, supplying protein nectar alone can't provide. Main prey includes mosquitoes, gnats, fruit flies, small bees, and spiders, caught either mid-air, gleaned directly from foliage, or pulled straight out of spider webs. Ruby-throated Hummingbirds will also visit sap wells drilled by Yellow-bellied Sapsuckers, picking off both the sap itself and the insects it attracts — an important food source for early spring migrants arriving before most flowers have opened.

Courtship and Mating

Males typically arrive at breeding grounds 7 to 10 days before females, immediately establishing and defending a territory. According to Rutgers NJAES Cooperative Extension, when a female enters a male's territory, he performs an elaborate courtship display: diving from as high as 50 feet directly above the female in a wide, U-shaped arc, followed by shorter horizontal passes flown directly in front of her, flashing his red gorget with each pass. The dive produces an audible whirring sound, generated in part by airflow over the wings and tail.

Mating is brief, and the male's involvement ends there entirely — females handle every subsequent stage, from nest-building through raising the young, entirely alone. Audubon's field guide notes that males typically go on to mate with multiple females across a single breeding season.

Nesting and Family Life

Females alone select the nest site, build the nest, incubate the eggs, and raise the young. According to the Tennessee Wildlife Resources Agency, favored nest sites are a slender, often gently downward-sloping branch of a deciduous tree — oak, hornbeam, birch, poplar, or hackberry are all documented choices, occasionally pine — usually 10 to 40 feet above the ground, though nests have also turned up on unlikely human-made supports like looped wire, chains, and even extension cords.

The nest itself is a real engineering feat: a compact cup roughly 2 inches across and 1 inch deep, with an inner cup about the size of a large thimble, built from plant down (often thistle or dandelion) bound together with spider silk. That silk is the key material — it lets the entire structure stretch as the growing chicks demand more room. Construction takes 6 to 10 days, and the female finishes by camouflaging the exterior with flecks of lichen and moss.

Clutch size is almost always exactly two pea-sized white eggs — a number research suggests is a true reproductive optimum: one egg would underuse the female's reproductive capacity, while three or more would likely outstrip her ability to feed all the chicks successfully. She lays the first egg, then typically waits a day before laying the second, with incubation beginning only once both are laid. Incubation lasts 12 to 16 days (occasionally longer in cool weather), and hatchlings emerge naked, roughly one inch long, and entirely helpless.

The nestling period runs 18 to 23 days on average, though it can stretch anywhere from 14 to 31 days depending on food availability — chicks reportedly double their body mass by day three after hatching, double again by day five, and again by day eight, right around when their first pinfeathers appear. Females in the southern US may raise up to three broods in a single season, sometimes starting a second nest while still feeding chicks from the first; females farther north typically have time for only one brood before migration season arrives.

Migration: One of the Most Demanding Journeys of Any North American Bird

This is the single most remarkable fact about the Ruby-throated Hummingbird, and it's backed by real field research: in the one to two weeks before fall migration, the species enters a state called hyperphagia, feeding intensively enough to roughly double its entire body weight — banders have documented birds going from about 3.25 grams to over 6 grams, storing visible bands of fat across the back, belly, and throat.

That stored fat fuels what EarthSky has called a migratory marathon. Many individuals fly directly across the Gulf of Mexico, a nonstop crossing of up to 500 miles that takes 18 to 22 hours of continuous flight under favorable conditions — no rest, no food, no water, the entire way. A four-year field study led by researcher Theodore Zenzal Jr. at the University of Southern Mississippi, based at Bon Secour National Wildlife Refuge on the Alabama coast and published in The Auk: Ornithological Advances, documented individual hummingbirds covering distances exceeding 1,200 miles without a break. Other individuals take a longer but safer overland alternative instead, skirting the western Gulf by following the Texas coastline south into Mexico — researchers believe the choice likely comes down to a bird's individual fat reserves, wind conditions, and experience, with older, more experienced birds generally better equipped for the demanding over-water route.

A related study, published in the peer-reviewed journal Movement Ecology and hosted by the National Institutes of Health, used stable-hydrogen isotope analysis of feathers to trace individual migrants back to their probable breeding latitudes, confirming that hummingbirds from across the entire eastern breeding range — from roughly 30° to 50° North — funnel through the same Gulf Coast stopover sites before making their crossing, a pattern researchers describe as "chain migration."

The risk is real. Ruby-throated Hummingbirds migrate during peak Atlantic hurricane season, and strong headwinds over open water can deplete fat reserves faster than a bird can replace them — under-fueled or unlucky individuals simply don't survive the crossing. The birds that do arrive on the Yucatan Peninsula often do so exhausted and severely depleted, sometimes weighing as little as 2.5 grams by landfall, and spend several days afterward feeding heavily before continuing on.

If you want to watch this unfold in real time, Journey North's migration tracking project maps citizen-reported first sightings as the wave moves north each spring.

Key paper: Supp, S.R. et al. (2018). "Temporal migration patterns between natal locations of ruby-throated hummingbirds and their Gulf Coast stopover site." Movement Ecology.

Following the Ruby-throated Across the Regions

No other North American hummingbird passes through as much of the country as this one. Five of the eight U.S. birding regions see Ruby-throats every year, and the calendar shifts by weeks as you move north:

• Southeast — the front door. Gulf Coast arrivals in late February and early March are the first Ruby-throats to touch the United States each year, straight off the water.
• Southwest — the overland detour. Birds that skip the Gulf crossing follow the Texas coast instead, making the eastern edge of this region a spring and fall corridor rather than a breeding stronghold.
• Great Plains — the hard western wall. Ruby-throats breed commonly up to roughly the 100th meridian and then stop, one of the sharpest range boundaries of any American bird.
• Midwest — the heartland of the breeding range, filling in through April as the leaves come out.
• Northeast & Mid-Atlantic — the last stop. May arrivals here get the shortest season of anyone, with many females managing only a single brood before turning around.

Follow that sequence from February to May and you're tracking the same wave of birds moving north across the continent, one region at a time.

Torpor: Nightly Survival Mode

Like other hummingbirds, Ruby-throated Hummingbirds can enter torpor — a dramatic, controlled drop in both body temperature and metabolic rate — during cold nights or whenever energy reserves run low. According to Rutgers Cooperative Extension, a hummingbird in torpor can reduce its breathing rate, heart rate, and internal body temperature for up to 12 hours at a stretch, in a state comparable to hibernation on a nightly scale. This lets the bird conserve just enough energy to make it to sunrise and the resumption of feeding, rather than burning through fat reserves it may need for migration or simply survival.

Habitat

During the breeding season, Ruby-throated Hummingbirds favor deciduous and pine forests, forest edges, orchards, and gardens — anywhere offering a mix of nectar sources and suitable nesting cover. Audubon's field guide additionally lists coasts and shorelines, shrublands, savannas, thickets, and urban and suburban habitats among the environments where the species turns up regularly. In winter, the same birds shift into tropical deciduous forest, citrus groves, forest edges, hedgerows, river and marsh corridors, and old fields across their Mexican and Central American wintering range.

Ruby-throated Hummingbird by Region: Where and When to Find Them

Because this is the primary — often the only — hummingbird species across most of the eastern half of the country, the Ruby-throated Hummingbird is the featured species in the large majority of our state-by-state guides.

Build a Ruby-throated Hummingbird Sanctuary in Your Own Yard

Because this species undertakes one of the most physically demanding migrations of any North American bird, the single most valuable thing a backyard host can offer is a reliable, well-timed food source — both when hummingbirds first arrive hungry from a long spring journey, and again in late summer and fall, when they're building the fat reserves that will carry them across the Gulf of Mexico or around the Texas coast.

• Use a leak-proof, easy-to-clean feeder like the AspenPerch® Hummingbird Feeder, with a comfort perch so birds can rest between sips rather than hovering the entire time.
• Keep nectar fresh and available from spring arrival through fall departure — this is especially critical in the weeks before migration, when a Ruby-throated Hummingbird may be trying to roughly double its body weight. Pop's Nectar, with added electrolytes and calcium, supports exactly this kind of intense energetic demand.
• Add a swing near your feeder — a Pop's Original Hummingbird Swing gives a territorial Ruby-throated Hummingbird a place to perch, rest, and watch over its feeding area between visits.
• Plant real native nectar sources, not just a feeder. Cardinal flower, trumpet creeper, bee balm, jewelweed, and red buckeye are all documented favorites, and timing a few of these to bloom in early spring and again in late summer directly supports both spring arrival and fall migration fueling.
• Skip the insecticide entirely. Since insects and spiders are a critical part of this species' diet — not an occasional snack — pesticide use removes food this bird depends on. Use HummGuard™ nectar tips instead to keep bees and wasps out of your feeder without harming anything else.

Timing is the part that changes most from state to state. Hummingbird feeding in Texas starts in February and doubles as a fall staging ground for birds rounding the Gulf, while Georgia and Ohio sit squarely in the breeding heartland with a long, steady season. Farther north, attracting hummingbirds in New York means a compressed window that doesn't open until May. Find your own state in the full hummingbird guide by state series.

Frequently Asked Questions

Why is it called the Ruby-throated Hummingbird if only males have a red throat? The species was named for the male's gorget, the iridescent red throat patch that gives the bird its common name. Females and juveniles lack this feature entirely, but naming conventions for birds typically describe the more visually distinctive sex, which in hummingbirds is almost always the male.

How far do Ruby-throated Hummingbirds migrate? Many travel over 3,000 miles round trip between breeding grounds in the eastern US and Canada and wintering grounds in Mexico and Central America, including a nonstop flight across the Gulf of Mexico of up to 500 miles that can take 18–22 hours.

Do Ruby-throated Hummingbirds really fly across the Gulf of Mexico without stopping? Yes, for many individuals. Research from the University of Southern Mississippi has tracked Ruby-throated Hummingbirds flying nonstop distances exceeding 1,200 miles during fall migration, though many others take a longer overland route around the Gulf via the Texas coastline instead.

How do Ruby-throated Hummingbirds prepare for migration? They enter a state called hyperphagia, roughly doubling their body weight in the one to two weeks before departure by feeding heavily on nectar and insects, storing the extra weight as fat to fuel the journey.

Is the Ruby-throated Hummingbird the only hummingbird in the eastern United States? It's the only hummingbird species that breeds regularly anywhere east of the Great Plains, though rare western species like the Rufous Hummingbird occasionally show up as vagrants, especially in fall and winter.

How can I attract Ruby-throated Hummingbirds to my yard? Keep a leak-proof feeder filled with fresh, dye-free nectar up from spring through fall, and plant native, tubular red or orange flowers like cardinal flower, trumpet creeper, and bee balm alongside it for a real food source, not just a supplement.

At Pop's Birding, we believe every backyard — big or small — has room for a little more wonder. Explore our feeders, nectars, swings, and wildflower seed blends to start building your own hummingbird sanctuary today.