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Summary

The white-bellied woodstar (Chaetocercus mulsant) is a species of hummingbird in tribe Mellisugini of subfamily Trochilinae, the "bee hummingbirds". It is found in Bolivia, Colombia, Ecuador, and Peru.

Taxonomy and systematics

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.

Description

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.

Distribution 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).

Behavior

The white-bellied woodstar is mainly sedentary though the records up to 4000 m suggest that it makes seasonal elevational movements.

The white-bellied woodstar forages at all levels of vegetation, taking nectar from a variety of flowering plants and trees including Agave, Inga, and Lantana. It also eats small arthropods. It does...