Ruby-Throated Hummingbird or Anna's Hummingbird?
Here's how to tell the difference
Ruby-Throated Hummingbird
Anna's Hummingbird
Ruby-Throated Hummingbird
Archilochus colubris
General appearance
The ruby-throated hummingbird is a small bird with iridescent green plumage on its back and head, and white underparts. It has a slender, straight bill designed for feeding on nectar. Its wings are narrow and enable rapid, agile flight, making a buzzing sound that is often the first indicator of its presence in the wild.
Male vs female
Males are distinguished by their striking ruby-red throat patch, known as a gorget, which can appear black in poor lighting. Their tail feathers are forked with a dark, iridescent blue-green. Females lack the bright throat patch and instead have white underparts with a light spotting or streaking. Their tail feathers are rounded and edged with white.
Juvenile
Juveniles resemble adult females with similar green and white coloring. They lack the distinctive gorget of adult males. As they mature, young males begin to develop the red throat feathers that gradually replace the white of their juvenile plumage. Juveniles have buffy edges to their plumage, especially noticeable on the breast.
Size
2.8 - 3.9 in/0.1 - 0.2 oz
There's more to learn about Ruby-Throated Hummingbird
View full detailsAnna's Hummingbird
Calypte anna
General appearance
Feast your eyes on Anna's hummingbirds! These radiant beauties are a vibrant combination of elegant form and stunning color. Their body is adorned with green and grey shades, offering a subtle yet captivating sight. The lower body beams with a light grey-white color, balancing the otherwise rich tones. Despite their relatively small size of about 9cm, they own their presence, darting daringly through the skies.
Male vs female
Males and females of Anna's hummingbirds showcase a delightful color variation. The males steal the spotlight with their breath-taking iridescent crimson-red crowns and throats, shimmering brilliantly in direct sunlight. Their back is metallic green, a perfect contrast to their radiant front. The ladies, on the other hand, adorn a more modest attire of green on top and greyish white underneath. Some females may display a subtle touch of red marking on their throat, adding a dash of secret charm.
Juvenile
The juveniles initially mirror the females in coloration carrying the green-grey theme. But as they grow, the young male Anna's hummingbirds start developing their glamorous red feathers that herald their entry into adulthood. A hint of this transformation is their first indicator of age. Regardless of age, the Anna's hummingbirds keep their vibrant energy, embodying the spirit of free flight throughout their life!
Size
3.7 - 4.1 in/0.1 - 0.2 oz
There's more to learn about Anna's Hummingbird
View full detailsHow to tell the Ruby-Throated Hummingbird from the Anna's Hummingbird
Visual differences
The Ruby-Throated Hummingbird is smaller (2.8-3.9 inches, 0.07-0.21 ounces) with iridescent green back and striking male ruby-red gorget. Females have white underparts and rounded tails. Anna's Hummingbird is larger (3.7-4.1 inches, 0.14-0.16 ounces) with metallic green back and male's iridescent crimson-red crown and throat. Females exhibit subdued green-grey with possible red throat spots. Both have slender bills, but Anna's exhibit a noticeable vibrant crown, while Ruby-Throated focuses on the gorget. Both species share similar iridescent green but vary in gorget and crown prominence.
Key differences and behavior
Ruby-throated hummingbirds (Archilochus colubris) and Anna's hummingbirds (Calypte anna) display distinct behaviors and habitat preferences. Ruby-throated hummingbirds frequent eastern North America's semi-open habitats, migrating to Central America in winter. They perform U-shaped courtship displays and build camouflaged nests in trees or shrubs. In contrast, Anna's hummingbirds reside year-round along the western U.S. coast, nesting as early as December. Their courtship involves dramatic 12-second dives with a loud pop. Both species feed on flower nectar and insects, but Anna's hummingbirds are highly adaptable, using urban feeders extensively unlike their migratory counterparts. Ruby-throated hummingbirds are smaller (2-3.5 inches long) compared to Anna's (3.75-4 inches), reflecting variances in their ecological niches.
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