Ruby-Throated Hummingbird or Anna's Hummingbird?

Here's how to tell the difference

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Ruby-Throated Hummingbird

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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

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How 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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