The Flame-rumped Tanager (*Ramphocelus flammigerus*) is a dazzling avian jewel of the lowland forests and edges of western Colombia and Ecuador, instantly recognizable by its most striking feature: the male’s brilliant, fiery-orange lower back, rump, and uppertail coverts that blaze like a living ember against its otherwise velvety black body. Females are more subtly elegant, with a warm olive-brown back and a softer, golden-orange rump, while both sexes share a unique, silvery-blue, swollen base to the lower mandible that gives the bill a chunky, metallic appearance. This tanager’s vibrant plumage serves as a visual beacon in the dappled understory, where it often joins mixed-species flocks to feast on fruit and insects, and its loud, sharp *chee-up* calls punctuate the humid air. A special behavioral trait is its tendency to aggressively defend fruiting trees, flashing its namesake rump like a territorial warning signal.

Faits amusants

The Flame-rumped Tanager’s fiery red rump is actually a result of structural coloration—microscopic feather structures scatter light to create that intense, almost neon glow, which males flaunt in dramatic “rump-flash” displays to rivals and mates. They are notorious for their “anting” behavior, where they deliberately rub ants or other acidic insects over their feathers, using the formic acid as a natural insecticide and fungicide. A quirky social habit involves joining mixed-species flocks with honeycreepers and euphonias, where they act as noisy sentinels, but they also engage in odd “bowing” courtship rituals where males rapidly bob their heads while fanning their tails, creating a pulsing red signal. Unlike many tanagers, they occasionally eat small fruits whole and then regurgitate the seeds far from the parent tree, acting as key seed dispersers for tropical forests.

Habitats et répartition

The Flame-rumped Tanager is found along the Pacific slope of the Andes from western Panama through Colombia to extreme northwestern Ecuador. Its preferred habitats include humid and wet lowland forests, forest edges, secondary growth, and shaded coffee plantations, often near streams or watercourses. It also adapts well to disturbed areas and human-modified landscapes, such as gardens and clearings, typically ranging from sea level up to around 1,200 meters in elevation.

Comportements & Reproduction

Males are highly territorial during the breeding season, using vivid red rump patches in aggressive displays to defend feeding and nesting areas from rivals. Pairs are socially monogamous for the season, though extra-pair copulations occur occasionally. Courtship involves the male bowing and flicking his wings to showcase his fiery rump while singing a high-pitched, buzzy song. The female builds a cup-shaped nest alone, typically in a dense thicket or tree fork, and incubates two to three pale blue eggs with brown spots for about 13 days. Both parents feed the nestlings, which fledge after roughly 15 days. A unique strategy is their use of male-plumage mimicry: first-year males retain duller female-like feathers until their second year, which reduces aggression from dominant adults and allows them to sneak copulations near established territories.

Alimentation

The Flame-rumped Tanager is primarily frugivorous, with a diet centered on a wide variety of small, soft fruits and berries, such as those from mistletoe, melastomes, and various tropical trees. It also actively consumes nectar, often visiting flowering trees and shrubs, and supplements its diet with protein by gleaning small insects, spiders, and other arthropods from foliage and bark. An interesting behavioral fact is that this tanager is known to follow army ant swarms not to eat the ants, but to catch the insects and small prey flushed out by the ants' advance. Additionally, while it often forages in pairs or small family groups, it will readily join mixed-species feeding flocks, particularly when fruit is abundant, and it frequently returns to the same fruiting trees daily until the crop is exhausted.

Couleurs

The male Flame-rumped Tanager is strikingly black with a brilliant, flame-orange or red rump, lower back, and upper tail coverts, while the female is more subdued with olive-brown upperparts, yellowish underparts, and a duller orange rump. Its most unique feature is the intense, fiery patch on the lower back, which creates a sharp contrast against the dark body, serving as a conspicuous signal rather than camouflage, with no cryptic adaptations.