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White-bellied woodstar
Male, Chocó, Colombia
Female, Cundinamarca, Colombia
Conservation status
Least Concern  (IUCN 3.1)
CITES Appendix II (CITES)
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Chordata
Class:	Aves
Clade:	Strisores
Order:	Apodiformes
Family:	Trochilidae
Genus:	Chaetocercus
Species:	C. mulsant
Binomial name
Chaetocercus mulsant (Bourcier, 1843)
Synonyms
Acestrura mulsant

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

Movement

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

Feeding

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 not defend feeding territories, and because of its small size and slow bumblebee-like flight it is able to feed in the territories of other hummingbirds.

Breeding

Almost nothing is known about the white-bellied woodstar's breeding phenology. One nest was discovered in April in Ecuador; it was about 10 m (30 ft) up in tree.

Vocalization

The white-bellied woodstar's calls include "a rather low-pitched 'djup' note and higher-pitched dull 'chip'."

Status

The IUCN has assessed the white-bellied woodstar as being of Least Concern. It has a large range, and though its population size is not known it is believed to be stable. It is considered uncommon to locally common in various parts of its range and may be more common than thought because it is easy to overlook. It appears to adapt to human-made landscapes.

References

1. ^ BirdLife International (2016). "Chaetocercus mulsant". IUCN Red List of Threatened Species. 2016: e.T22688251A93189389. doi:10.2305/IUCN.UK.2016-3.RLTS.T22688251A93189389.en. Retrieved 25 July 2022.
2. "Appendices | CITES". cites.org. Retrieved 2022-01-14.
3. ^ Remsen, J. V., Jr., J. I. Areta, E. Bonaccorso, S. Claramunt, A. Jaramillo, D. F. Lane, J. F. Pacheco, M. B. Robbins, F. G. Stiles, and K. J. Zimmer. Version 24 July 2022. A classification of the bird species of South America. American Ornithological Society. https://www.museum.lsu.edu/~Remsen/SACCBaseline.htm retrieved July 24, 2022
4. ^ Gill, F.; Donsker, D.; Rasmussen, P., eds. (January 2022). "Hummingbirds". IOC World Bird List. v 12.1. Retrieved January 15, 2022.
5. HBW and BirdLife International (2020) Handbook of the Birds of the World and BirdLife International digital checklist of the birds of the world Version 5. Available at: http://datazone.birdlife.org/userfiles/file/Species/Taxonomy/HBW-BirdLife_Checklist_v5_Dec20.zip retrieved 27 May 2021
6. Remsen, J. V., Jr., J. I. Areta, E. Bonaccorso, S. Claramunt, A. Jaramillo, D. F. Lane, J. F. Pacheco, M. B. Robbins, F. G. Stiles, and K. J. Zimmer. Version 24 July 2022. Species Lists of Birds for South American Countries and Territories. https://www.museum.lsu.edu/~Remsen/SACCCountryLists.htm retrieved July 24, 2022
7. ^ Züchner, T., P. F. D. Boesman, and G. M. Kirwan (2020). White-bellied Woodstar (Chaetocercus mulsant), version 1.0. In Birds of the World (J. del Hoyo, A. Elliott, J. Sargatal, D. A. Christie, and E. de Juana, Editors). Cornell Lab of Ornithology, Ithaca, NY, USA. https://doi.org/10.2173/bow.whbwoo6.01 retrieved July 25, 2022

• IUCN Red List least concern species
• Chaetocercus
• Birds of the Northern Andes
• Birds described in 1842
• Taxa named by Jules Bourcier