Anna's Hummingbird: How to Identify That Rose-Pink Head at Your Feeder
If you just saw a hummingbird outside a window in January and it looked like its whole head was lit up in glowing pink and magenta, not just a throat patch but the crown too, you weren't imagining it, and you weren't seeing something rare. You were almost certainly looking at a male Anna's Hummingbird (Calypte anna), the common, year-round hummingbird of the West Coast, and one of the very few hummingbird species in North America that doesn't bother leaving for winter. Here's how to confirm it, how to tell the plainer females and juveniles apart, and why that bird is at your feeder in the first place when every field guide you half-remember says hummingbirds migrate south.
The One Field Mark That Actually Confirms It
Most hummingbird identification comes down to a gorget, the patch of iridescent feathers on the throat. Anna's Hummingbird breaks that pattern. Per Cornell Lab's All About Birds, the male's gorget "extends over the head like a balaclava," meaning the same brilliant iridescence that colors his throat also covers his entire crown, the top of his head, not just a spot below the bill. The National Park Service makes the same point even more directly: "unlike other North American hummingbirds, this rose iridescence also covers his crown." That's the actual field mark worth learning. A hummingbird with color confined to the throat is a different species; a hummingbird wearing what looks like a full iridescent hood, head and throat both, in the same rose-pink to magenta range, is a male Anna's.
Like all iridescent hummingbird color, that pink isn't pigment, it's structural, produced by microscopic feather structures that reflect certain wavelengths depending on the angle of light. That's why the same bird can look brilliant rose one second and dull brownish-gray the next, which our full explainer on hummingbird colors covers in more depth if you want the mechanism rather than just the identification shortcut. For field purposes, the practical version is simpler: catch the bird at the right angle, in direct light, and the head-to-throat iridescence is unmistakable.
Male, Female, or Juvenile?
Females look genuinely different, and this trips people up because it doesn't match the "just look for the pink throat" advice that works for other species. According to All About Birds, females are "metallic green above and grayish below with bits of reddish spotting on the throat," and they show "a pale line over the eye," but they lack the full gorget entirely. That reddish throat spotting is worth noting specifically: Cornell describes it as "a small red gorget, unusual for their species," since female hummingbirds generally don't carry any throat color at all. So a female Anna's can show a little color and still not be a male; the difference is coverage, a handful of spots versus a full, connected hood.
Juveniles add one more layer. Per the U.S. Geological Survey's identification notes, immature Anna's Hummingbirds resemble females, gray-breasted rather than showing the adult male's coloring, and young males don't grow their full crown-and-gorget iridescence until later. Practically, that means "gray-breasted with at most a little throat spotting" covers both females and young birds of either sex; only a fully colored head confirms an adult male. For the general mechanics of sexing hummingbirds across species, beyond what's specific to Anna's, our male vs. female hummingbird guide goes deeper.
The Species Most Likely to Confuse You: Costa's Hummingbird
In parts of the Southwest where ranges overlap, Costa's Hummingbird is the real look-alike risk, since it also has an iridescent purple crown and gorget on adult males. All About Birds' species comparison lays out the distinction: male Costa's have "a much deeper purple gorget that extends farther on the sides of the neck" than Anna's, giving Costa's a more angular, winged look to the throat patch, plus Costa's males lack Anna's rose-pink crown color entirely. On the female side, the same source notes that female and immature Costa's "don't have central red feathers on the throat that most female/immature Anna's Hummingbirds have," which is a useful negative check when you're not sure. If you want the fuller rundown of which species show up where across the country, our guide to types of hummingbirds you'll actually see in the US is the hub post this one connects to.
Why You're Seeing One in the Middle of Winter
This is the part that surprises people most, and it's the actual reason "Anna's Hummingbird in January" isn't a contradiction. Per All About Birds' range page, "unlike most North American hummingbirds, Anna's Hummingbirds either don't migrate or else migrate a very short distance to better feeding grounds." It's one of only three hummingbird species that lives in the US year-round. There's also a documented human-assisted backstory here, not just a fixed trait of the species. Audubon reports that the range expansion is "largely because of us," citing a study finding that Anna's Hummingbirds "tend to colonize new locations, even cold ones, based on housing density, that is, how many people live there, and the availability of flowery landscaping and nectar feeders." In other words, backyard feeders and ornamental winter-blooming plants didn't just help an existing wintering population get by, they're part of why the bird can winter that far north and inland at all.
That does put a bit of responsibility on anyone who keeps a feeder up through a hard freeze, since a resident Anna's is depending on it in a way a migratory species passing through in September isn't. Cold nights are survived through torpor, a temporary, dramatic drop in metabolism, which our separate guide to hummingbird torpor covers in full rather than repeating here. Keeping the nectar itself liquid and unspoiled through that same cold stretch is a distinct, practical problem, covered start to finish in our winter feeder care guide. It's a genuinely year-round commitment for a resident bird rather than a spring-through-fall one, which is part of why we keep our own nectar simple, our clean formula and water with nothing else added, the same thing a flower would offer, whether it's June or January (you can find it at our Shopify shop if you're curious, though plenty of honest options exist).
Range and How It Got So Much Bigger
The historic range was much smaller than what you'll see on a current map. Per the National Park Service, "since the 1960s, a dramatic range expansion brought Anna's hummingbirds northward and eastward from their historical habitat in southern California chaparral." Audubon pins the historic range down more specifically to "southern California and the Baja Peninsula," with ornithologists documenting the expansion since the 1930s and the bird now found "as far north as British Columbia and as far east as Texas." The Audubon Field Guide adds that current breeding range runs "from British Columbia south to Arizona," with Arizona birds tending to move west toward California after nesting rather than making a true long-distance migration. Habitat is broad and adaptable: chaparral, coastal scrub, oak woodland, and increasingly gardens, parks, and other urban and suburban settings, which tracks with the feeder-and-landscaping story above.
The Dive That Sounds Like a Chirp, Not a Bird
Beyond the head coloring, the other unmistakable Anna's Hummingbird behavior is the male's courtship dive, and it's genuinely one of the more remarkable things a bird this small does. Per Cornell's life history page, a displaying male "climbs up to 130 feet into the air and then swoops to the ground with a curious burst of noise" produced through his tail feathers rather than his voice. That noise isn't a coincidence of wind resistance, it's a real, deliberately-studied mechanism. Research out of UC Berkeley, led by Christopher Clark with Teresa Feo under advisor Robert Dudley and reported by ScienceDaily, found that males missing the outer pair of tail feathers "were unable to make dive sounds," and wind tunnel testing showed those feathers' vanes "act like a reed in a clarinet," vibrating at "a frequency of 3.3-4.7 kilohertz, equivalent to the highest note on a piano," for roughly 60 milliseconds at the bottom of the dive. It's sound made by feathers acting like an instrument, not a call from the bird's throat.
The speed involved is where this gets almost hard to believe for a bird that weighs about as much as a nickel. National Geographic's coverage of Clark's follow-up research puts the male's top dive speed at 60 mph, which works out to 385 body lengths per second at peak velocity, a figure the article compares directly to a peregrine falcon's stoop (200 body lengths per second), a fighter jet with its afterburner engaged (150 body lengths per second), and the space shuttle during re-entry (207 body lengths per second). Pulling out of that dive subjects the bird to close to 9 g's of force, among the highest g-loads documented in any animal capable of controlled, voluntary flight. The bird handles it partly through very brief acceleration peaks and blood vessels built around short fluid columns, which makes it less vulnerable to the kind of blackout risk that same force would pose to a human pilot.
Diet and Everyday Behavior
Away from the display dives, Anna's Hummingbirds feed the way most hummingbirds do, just with a wider net than "nectar only." Cornell lists nectar sources including "currant, gooseberry, manzanita," alongside "a wide array of insects from understory leaves," such as midges, whiteflies, and leafhoppers, plus tree sap and any insects caught in it. The Audubon Field Guide notes males are "notably vocal for hummingbirds," delivering a buzzy song from a perch, and unlike some related species, they hold their tails still while hovering rather than pumping them. They're also territorial, readily defending a favored feeder or flowering shrub from other hummingbirds, a behavior familiar to anyone who's watched one bird camp out beside a feeder for weeks.
Nesting Season Starts Absurdly Early
One more consequence of not migrating: breeding starts far earlier than most people expect. Both the National Park Service and Audubon put the breeding window at roughly December through May, with nesting sometimes beginning in December itself, months before most other North American hummingbirds have even returned from wintering grounds. Females build small, camouflaged cup nests, per Cornell typically "1 inch tall by 1.5 inches in diameter," using plant down and spider webs on a horizontal branch 6 to 20 feet up, often in oak, sycamore, or eucalyptus trees, and can raise two to three broods of two eggs each in a single season.
Frequently Asked Questions
How can you tell a male Anna's Hummingbird from a female?
Coverage is the key difference. Adult males show iridescent rose-pink to magenta color across the entire crown and throat, like a full hood. Females are green above and pale gray below, with at most a few small reddish spots in the center of the throat rather than a full gorget, and juveniles resemble females regardless of sex.
Do Anna's Hummingbirds migrate?
Mostly no. According to Cornell's All About Birds, Anna's Hummingbirds either don't migrate at all or move only a short distance to better feeding grounds, making them one of just three hummingbird species that live in the US year-round rather than heading to Mexico or Central America for winter.
Why does a male Anna's Hummingbird dive and make a chirping sound?
It's a courtship display. The male climbs as high as 130 feet, then dives toward the ground at speeds up to 60 mph, and the chirp at the bottom of the dive is produced by his outer tail feathers vibrating like a reed, not by his voice, according to research out of UC Berkeley.
What's the difference between an Anna's and a Costa's Hummingbird?
Male Costa's Hummingbirds have a deeper purple gorget that flares out more on the sides of the neck and no rose-pink crown, while male Anna's have rose-pink to magenta color covering the crown as well as the throat. Female Costa's also typically lack the small central red throat feathers that many female Anna's show.
Why am I seeing an Anna's Hummingbird at my feeder in winter?
Because it lives there year-round rather than migrating. Research cited by Audubon also links the species' expanded winter range partly to backyard nectar feeders and ornamental flowering landscaping, which have helped the bird colonize areas, including colder ones, it wouldn't otherwise reliably survive in.