White-throated mountaingem

The white-throated mountaingem (Lampornis castaneoventris) is a hummingbird which breeds in the mountains of western Panama. It is replaced in southern Costa Rica by the gray-tailed mountaingem, L. cinereicauda (García-Moreno et al., 2006). Another very close relative, the purple-throated mountaingem, is found sympatrically.

Female

White-throated mountaingem
Scientific classification
Kingdom: Animalia
Phylum: Chordata
Class: Aves
Order: Apodiformes
Family: Trochilidae
Genus: Lampornis
Species:
L. castaneoventris
Binomial name
Lampornis castaneoventris
(Gould, 1851)
Synonyms

Lampornis castaneoventris castaneoventris (Gould, 1851)

This bird is 10.5 cm long. The shortish black bill is slightly curved.

The adult male has bronze-green upperparts and underparts except for a brilliant green crown, white throat and blue tail. The female lacks the bright crown and throat, and has rich cinnamon underparts. Young birds resemble the female but have buff fringes to the upperparts plumage.

The female white-throated mountaingem is entirely responsible for nest building and incubation. She lays two white eggs in a deep plant-fibre cup nest m high in a scrub, small tree or vine. Incubation takes 15–19 days, and fledging another 20–26.

The food of this species is nectar, taken from a variety of small flowers, including epiphytic Ericaceae. Like other hummingbirds it also takes small insects as an essential source of protein. Male white-throated mountaingems defend flowers and scrubs in their feeding territories, and are dominant over most other hummingbirds.

White-throated mountaingem

References
  1. BirdLife International (2016). "Lampornis castaneoventris". The IUCN Red List of Threatened Species. IUCN. 2016: e.T22725795A94902462. doi:10.2305/IUCN.UK.2016-3.RLTS.T22725795A94902462.en. Retrieved 15 January 2018.
  • García-Moreno, Jaime; Cortés, Nandadeví; García-Deras, Gabriela M. & Hernández-Baños, Blanca E. (2006): Local origin and diversification among Lampornis hummingbirds: A Mesoamerican taxon. Molecular Phylogenetics and Evolution 38(2): 488–498. doi:10.1016/j.ympev.2005.08.015 (HTML abstract)
  • Stiles, F. Gary & Skutch, Alexander F. (1990): A guide to the birds of Costa Rica. Cornell University Press. ISBN 0-8014-9600-4
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