This species is very similar in appearance to Ruby-throated Hummingbird. In all plumages, note the fairly long and slightly decurved bill, the dull crown, and the wide club-shaped outer primaries. Male: Emerald green above. The underparts are dull white with gray-green sides and flanks forming a dark “vest.” The white of the upper breast extends around the sides of the neck, creating a white collar. The gorget is black with a band of purple on the lower throat. In certain light, the entire head looks black. The tail is slightly notched and extends just beyond the wingtips at rest. The center two tail feathers are green, while the others are blackish. Female: Dull golden green above. Pale gray below, with gray-green wash on the sides and a touch of buff on the flanks. The forecrown is dull gray, fading to green at the back of the crown. Throat is whitish, and may have streaking or spotting. The tail is rounded, and projects slightly beyond the wingtips at rest. Center tail feathers are green, others have green bases and black bands. Outer three sets have white tips. Juveniles resemble adult females, but have buffy feather edges on the upperparts. Juvenile females have white tips on the next-to-center set of tail feathers. Juvenile males have shorter bills than females, and show spots of black or purple on the throat.

Length: 9 (cm) Wingspan: 10 (cm)

Voice:

Call is a buzzy tewp. In flight, male's wings produce a low whistle.

Habitat:

Riparian woods, wooded canyons, residential areas.

Behavior:

Often pumps tail while hovering.

Feeding:

Feeds on floral nectar and small insects.