Bronze-tailed Plumeleteer

Identification

The bronze-tailed plumeleteer is a small hummingbird, measuring 10.5 to 12 cm in length, with males weighing about 7.1 g and females about 6.1 g. Both sexes share a distinctive black maxilla and black tip to the mandible, with the rest of the mandible dull pink to dark red. The nominate subspecies shows the most glittering appearance: males display metallic green upperparts and glittering green underparts, with characteristic long fluffy white undertail coverts and a bronze-green tail. Females are metallic green above but gray below with green flecks on the sides, grayish-white undertail coverts, and outer tail feathers tipped with gray. Immature birds resemble adults but show buffy to cinnamon fringing on the crown, nape, and rump feathers.

Subspecific variation is notable across the bird's range. The northern subspecies C. u. melanorrhoa has darker green upperparts with purplish bronze uppertail coverts, a dusky bronze belly, and a purplish-black tail. The C. u. isaurae subspecies features males with a distinctive blue throat and breast, bluish-green belly, and a brighter bronze tail than the nominate form, while females have pale gray underparts with minimal green flecking.

Range & Habitat

The bronze-tailed plumeleteer is found across Central America and northwestern South America, with its range spanning Colombia, Costa Rica, Ecuador, Nicaragua, and Panama. The northernmost subspecies, C. u. melanorrhoa, occurs from eastern Nicaragua into Costa Rica with a few records in eastern Honduras. Subspecies C. u. isaurae inhabits the Caribbean slope and locally the Pacific slope of Panama and extreme northwestern Colombia, while the nominate subspecies ranges from eastern Panama's Darién Province through north-central and western Colombia into northwestern Ecuador.

This species favors humid forest interiors and edges, mature secondary forest, and semi-open landscapes such as banana plantations and gardens, but avoids completely open areas. Elevational range varies by location, from sea level up to 700 m in Costa Rica and up to 900 m in Colombia.

Behaviour & Diet

The bronze-tailed plumeleteer is an active and aggressive forager, especially defending rich nectar sources such as Heliconia patches. It typically forages from the understory to mid-strata, occasionally visiting epiphytes in the sub-canopy. Besides nectar, it supplements its diet by hawking small arthropods from a perch and gleaning insects from foliage. The bird feeds on nectar from a variety of plants including Heliconia, Renealmia, Costus, Psychotria, Malvaviscus, Acanthaceae, and Inga.

The northern subspecies is known to make local seasonal movements, likely tracking flowering plants, though movements in other subspecies are undocumented. Breeding occurs primarily between February and April in both Costa Rica and Colombia, with an extended season in Costa Rica from December to June. The bird constructs a characteristic deep cup nest of pale plant down and fibers bound with spiderweb, covered externally with moss and lichen, typically placed in a shrub 0.5 to 1.5 m above the ground, often near streams or trails. Vocalizations include a soft, nasal, scratchy trilled song phrase, energetic chattering trills during chases, and loud chup and chip notes.

Best Time & Places to See It

The bronze-tailed plumeleteer is still locally common at many sites throughout its range despite habitat loss in Central America, particularly in Costa Rica and Panama. Visitors should focus on humid forest edges, mature secondary forest, and areas with flowering plants, especially Heliconia-rich patches. The bird ranges from sea level to moderate elevations, making it accessible in many lowland and foothill locations.

The primary breeding season from February to April offers the best opportunities for observation in both Costa Rica and Colombia, when birds are most active and vocal. The extended breeding window in Costa Rica (December to June) provides a longer window for encounters in that country.

Photography Tips

Photographing the bronze-tailed plumeleteer requires patience and attention to its preferred feeding zones. Focus on flowering plants, especially Heliconia patches where the bird aggressively defends territory and returns predictably. The bird forages at moderate heights in the understory and mid-story, making it more accessible than canopy species. Early morning light best reveals the males' glittering green underparts and metallic sheen.

The long fluffy white undertail coverts of the nominate subspecies provide a distinctive visual marker for identification and composition. Work near streams and trails where nests are often placed, as birds may be more active in these areas. The bird's aggressive territorial behavior means males will often perch visibly while defending nectar sources, offering excellent opportunities for portrait shots and behavioral photography.