Black Flowerpiercer

En bref

  • Scientific Name: Diglossa humeralis
  • Spanish Name: Pinchaflor negro
  • Famille : Thraupidae
  • Known Nicknames: Black Flowerpiercer, Humeralis Flowerpiercer
  • Longueur moyenne : 11–12 cm / 4,3–4,7 pouces
  • Average Weight: 10–15 g / 0.35–0.53 oz
  • Envergure : N/A
  • Key Feature: Hook-tipped upper mandible used to pierce flower corollas for nectar
  • Primary Diet: Primarily Nectarivore, also consumes insects and fruit
  • Aire de répartition : Andes de Colombie, d'Équateur, du Pérou et de l'ouest du Venezuela
  • Habitat: Montane cloud forests and shrubby edges at 1,500–3,600 m elevation
  • Social Structure: Solitary or in pairs; sometimes joins mixed-species flocks
  • Nesting/Breeding: Cup-shaped nest in shrubs or small trees
  • Statut de conservation : Préoccupation mineure (LC)
  • Évolution démographique : Stable

The Black Flowerpiercer (*Diglossa humeralis*) is a master of botanical burglary, a small, sleek songbird of the Andean cloud forests that uses a uniquely adapted, hooked upper bill to pierce the base of flowers and steal nectar, bypassing the plant’s pollination system entirely. Cloaked in deep, glossy black plumage with a subtle bluish sheen, this finch-like bird features a distinctive pale grey “shoulder” patch (the *humeralis* in its name) and a sharply upturned lower mandible that acts like a tiny crowbar. Beyond its specialized feeding apparatus, it possesses a surprisingly loud, metallic song that echoes through its high-altitude habitat, and while it is a nectar thief, it also inadvertently pollinates some flowers when its head brushes against their reproductive parts. This agile, acrobatic bird is a fascinating example of evolutionary adaptation, turning its beak into a tool for exploiting a rich food source that other birds cannot access.

Faits amusants

Despite its name, the Black Flowerpiercer doesn’t sip nectar like a typical hummingbird; instead, it uses its uniquely hooked, upturned lower mandible to stab the base of a flower, prying it open to steal nectar without pollinating the plant—a classic “nectar robber.” It often hangs upside down like a tiny acrobat to reach tricky blossoms, and males have been observed aggressively chasing away much larger birds, including hummingbirds, from their favorite feeding patches. Remarkably, its tongue is split and fringed at the tip, allowing it to lap up the stolen nectar with surprising efficiency.

Habitats et répartition

The Black Flowerpiercer inhabits humid to semi-hhumid montane forests, forest edges, and adjacent shrubby clearings, primarily in the temperate and subtropical zones of the Andes. It is commonly found in elfin cloud forests and paramo borders, often frequenting areas with abundant flowering plants like *Bomarea* and *Fuchsia*. Its geographical range extends from southwestern Colombia (in the departments of Nariño and Cauca) south through Ecuador into northern Peru, including the Cordillera del Cóndor and the eastern slopes of the Andes. The species typically occurs at elevations between 2,000 and 3,500 meters, though local movements may occur seasonally.

Comportements & Reproduction

The Black Flowerpiercer is a solitary or pair-dwelling bird, with individuals fiercely defending feeding territories around clumps of flowering plants like *Bomarea* and *Fuchsia*. Males perform a short, fluttering song flight to attract females, and pair bonds form only for the breeding season. Courtship involves the male offering nectar or small insects to the female, a behavior tied to its unique feeding strategy of piercing flower bases with its hooked upper bill. The female builds a cup-shaped nest of moss and lichen in dense vegetation, where she lays two pale blue eggs with brown speckles. Incubation lasts about 13–14 days and is done solely by the female, while the male guards the territory and brings food to the nest. After hatching, both parents feed the chicks regurgitated nectar and insects, with fledging occurring around 17–19 days. A notable reproductive strategy is the bird’s reliance on specific high-altitude Andean flowers for both feeding and nesting material, making its breeding success tightly linked to the flowering phenology of its habitat. No cooperative breeding or polygamy has been observed.

Alimentation

The Black Flowerpiercer is a specialized nectarivore, but its feeding method is uniquely destructive rather than mutually beneficial. It uses its distinctive, sharply hooked upper bill to pierce the base of tubular flowers, stealing nectar without pollinating the plant, a behavior known as "nectar robbing." While nectar forms the bulk of its diet, it also supplements this sugary energy source by gleaning small insects, spiders, and other arthropods from leaves and bark, providing essential protein, especially during the breeding season. Interestingly, its aggressive feeding strategy often leaves visible, telltale holes at the corolla base of flowers, and it will frequently defend rich patches of flowers, such as those of *Bomarea* or *Fuchsia*, against other hummingbirds and flowerpiercers.

Couleurs

The Black Flowerpiercer is predominantly glossy black with subtle blue-black iridescence on its upperparts, while the underparts are a slightly duller sooty black. It has a distinctive, sharply hooked upper mandible that curves upward over the lower mandible, a specialized tool for piercing flower bases. Although unmarked by patterns or vivid colors, its uniform dark plumage provides effective camouflage in the shadowy understory of Andean cloud forests.