Heliodoxa Jacula

The green-crowned brilliant (''Heliodoxa jacula'') is species of hummingbird in the "brilliants", tribe Heliantheini in subfamily Lesbiinae. It is found in Colombia, Costa Rica, Ecuador, and Panama.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 xls zipped 1 MBretrieved 27 May 2021 It is also known as the green-fronted brilliant.

Taxonomy and systematics

The green-crowned brilliant has three subspecies, the nominate ''H. j. jacula'', ''H. j. henryi'', and ''H. j. jamersoni''.

Description

Male green-crowned brilliants are long and females . One female weighed . Both sexes of all subspecies have a white spot behind the eye and a forked tail, though that of the female is not as deeply indented as the male's.Taylor, J. (2020). Green-crowned Brilliant (''Heliodoxa jacula''), version 1.0. In Birds of the World (T. S. Schulenberg, Editor). Cornell Lab of Ornithology, Ithaca, NY, USA. https://doi.org/10.2173/bow.grcbri1.01 retrieved 7 May 2022

Adult males of the nominate subspecies have a glittering green to blue-green head and breast with a small metallic violet-blue patch on the throat. The upperparts and belly are bronzy green, the vent area white, and the thighs also white. The tail is blue-black. Adult females' blue-green head is not shiny like the male's. They also have a short white malar stripe. Their underparts are whitish and heavily spotted with green; the spots merge on the flanks. The tail is black and the outer feathers have white tips. Immature males have a dull bronzy green crown and underparts, a bright buff chin and malar, and a shallowly forked tail. Immature females have a bright buff throat and duller green spots on the underparts than the adult.

Subspecies ''H. j. henryi'' is larger than the nominate. Males' heads have a more brilliant glitter than the nominate's and their plumage is greener with less or no blue. Females have more white on their underparts and the separate green spots extend onto the flanks. Males of ''H. j. jamersoni'' are much duller than the nominate on the head and breast; their tail is shorter and its central feathers have a green gloss.

Distribution and habitat

The nominate subspecies of green-crowned brilliant is found from Panamá Province in eastern Panama into Colombia, where it inhabits all three Andean ranges. ''H. j. henryi'' is found more northerly, from Costa Rica south and east into Panama as far as Coclé Province. ''H. j. jamersoni'' is found from Colombia's Nariño Department (and possibly from further north in Cauca Department) south along the western slope of the Andes of Ecuador at least as far as El Oro Province.

The green-crowned brilliant inhabits a variety of landscapes including the interior, edges, and clearings of humid sub-montane and montane forest; mature secondary forest; and gardens. In elevation it generally ranges between in Costa Rica, though sometimes as low as . In Panama it is usually found between , in Colombia between , and in Ecuador between . There are also records as low as in Ecuador.

Behavior

Movement

The low-elevation records of green-crowned brilliant in Costa Rica and Ecuador may indicate seasonal movements.

Feeding

The green-crowned brilliant usually forages in the middle and upper strata of the forest. A primary source of nectar is ''Marcgravia'' vines, and females also feed at small understory plants. Males sometimes defend ''Marcgravia'' patches, though they also nectar by trap-lining, visiting a circuit of flowering plants. The species usually clings to flowers to feed rather than hovering.

Breeding

The green-crowned brilliant's nesting season in Costa Rica is thought to span from July or August to January and in Colombia from May to September. The nest is a bulky cup of plant fibers and scales of tree ferns saddled on a thin down-sloping branch, typically between above the ground. The female alone incubates the two white elliptical eggs.

Vocalization

The green-crowned brilliant makes "a loud and squeaky ''kyew'' or ''tyew'' call". In Costa Rica, displaying males make "a ''tseek, tseek, tseek''" call. During chases the species makes "loud sputtering notes and squeaks".

Status

The IUCN has assessed the green-crowned brilliant as being of Least Concern, though its population size is not known and is believed to be decreasing. No immediate threats have been identified. It has been recorded in several protected areas. It "shows some tolerance of habitat fragmentation, degradation and disturbance utoutright forest clearance is expected to cause local population declines".

Gallery

File:Green-crowned brilliant (Heliodoxa jacula henryi) male composite.jpg, Composite showing effect of light reflection on the color of male ''H. j. henryi''s gorget, Mount Totumas cloud forest, Panama
File:Green-crowned brilliant (Heliodoxa jacula henryi) juvenile.jpg, Juvenile ''H. j. henryi''

References

External links

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green-crowned brilliant
Birds of Costa Rica
Birds of Panama
Birds of the Tumbes-Chocó-Magdalena
Birds of Ecuador
green-crowned brilliant