White-bellied Woodstar

Chaetocercus mulsant

Woodstars are tiny hummingbirds that fly like large bumblebees. White-bellied is an Andean species found from Colombia to Bolivia. Males are mostly emerald green above with a bright white chest and belly, dark green sides, a glittering purple throat, and a forked tail. Their wings make a distinctive metallic whirring in flight. Females have a white throat, white eyeline, and rich buffy flanks. Both sexes have very prominent white patches on the sides of the lower back. Females in particular can be difficult to distinguish from other woodstars; look for their brighter and better-defined white belly patch and larger white patches on the sides of the lower back. Look for this species in a variety of wooded habitats, scrub, and gardens in the highlands from from 1,100-3,500m. Visits feeders.

Identification

The white-bellied woodstar is about 8.5 cm (3.3 in) long and weighs about 3.8 to 4 g (0.13 to 0.14 oz). Both sexes have a straightish black bill. The male's upperparts are dark bluish green which continues onto the flanks. A downcurving white line behind the eye meets the white upper breast. Its gorget is iridescent reddish violet. The belly is white as are patches on the flanks. The forked tail is bluish green and its outermost feathers are shafts with no vanes. The female is bronzy green above. It has a grayish "mask" and a buff stripe behind the eye. Its throat is pale cinnamon, the belly white, and the flanks tawny. Its tail is rounded; the central feathers are green and the others cinnamon with a wide black band near the end.

Taxonomy

The white-bellied woodstar and several other species in genus Chaetocercus were formerly placed in genus Acestrura but have been in their current position since the late 20th century. The species is monotypic.

Scientific name
Chaetocercus mulsant
Authority
(Bourcier, 1843)
Order
Apodiformes
Family
Trochilidae
Genus
Chaetocercus

Range and habitat

The white-bellied woodstar is found from the Central and Eastern Andes of Colombia south discontinuously through Ecuador and Peru into Bolivia as far as Cochabamba Department. It inhabits the edges of humid forest, pastures, and cultivated areas. In elevation it is most common between 2,200 and 2,800 m (7,200 and 9,200 ft) but is regularly found as low as 1,500 m (4,900 ft) and there are reports as high as 4,000 m (13,000 ft).

Migration
Resident species

Behavior

Migration pattern: Resident species.

Conservation

Population trend: stable.

Population trend
stable

Photos

Distribution

Bird Calls

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