Blue-mantled Thornbill

Quick Facts

  • Scientific Name: Chalcostigma herrani
  • Spanish Name: Picoespina de Herrán
  • Family: Trochilidae
  • Known Nicknames: Herran's Thornbill, Colibrí de Herrán
  • Average Length: 10–12 cm / 3.9–4.7 in
  • Average Weight: 5.5–6.5 g / 0.19–0.23 oz
  • Wingspan: Approx. 12–14 cm / 4.7–5.5 in
  • Key Feature: Short needle-like bill, rufous crown, deeply forked tail, and a narrow, elongated iridescent throat patch (gorget) shifting from green to yellow and red
  • Primary Diet: Nectarivore (primarily nectar from flowering shrubs, supplemented with small insects)
  • Range: Andes of Colombia, Ecuador, and northern Peru
  • Habitat: High-altitude paramo grasslands, elfin forest borders, and humid montane shrublands
  • Social Structure: Solitary and highly territorial
  • Nesting/Breeding: Cup nest constructed of moss, lichens, and plant fibers, typically placed in low shrubs or sheltered rock crevices
  • Conservation Status: Least Concern (LC)
  • Population Trend: Decreasing

The Blue-mantled Thornbill (*Chalcostigma herrani*) is an enchanting, high-altitude hummingbird native to the rugged paramo ecosystems of the Andes in Colombia, Ecuador, and Peru. Instantly recognizable by its remarkably short, needle-like bill, this resilient avian gem features a dark bronzy-green body beautifully contrasted by a glittering, metallic blue-green back (or "mantle") and a rich chestnut-rufous crown. Its most breathtaking attribute is the male's elongated, beard-like throat patch, or gorget, which displays a stunning iridescent gradient transitioning from luminous green to fiery shades of yellow, orange, and crimson. Adapted to harsh alpine winds, this unique bird often eschews typical hovering behavior, choosing instead to cling to low-lying flowers or even forage on the ground, making it a truly remarkable marvel of evolutionary adaptation.

Fun Facts

To survive the freezing high-altitude Andes, this hummingbird frequently ditches flying altogether, choosing to hop and crawl along the ground to forage in order to conserve precious energy. Because its bill is comically short, it acts as a "nectar robber," using its sharp beak to pierce the base of long tubular flowers to steal nectar from the outside. To survive sub-zero mountain nights, it plunges its body into a state of torpor, essentially freezing its metabolism, while during the day, males flaunt a spectacular, elongated throat patch that shifts in the light like a glowing, multi-colored beard.

Habitats & Distribution

This species is restricted to the high-altitude Andes of South America, with a geographical range extending from Colombia through Ecuador to northern Peru. Within this montane region, it is typically found at elevations ranging from 3,000 to over 4,200 meters above sea level, occupying isolated pockets of suitable high-elevation terrain along the mountain range. Its primary habitats consist of humid paramo grasslands, elfin forest borders, and sub-alpine shrublands near the tree line. It thrives in these rugged, windswept environments, where it is frequently observed foraging close to the ground among low-growing shrubs, terrestrial bromeliads (such as *Puya*), and rocky outcrops.

Behaviours & Reproduction

Highly solitary and aggressively territorial, this species actively defends localized nectar sources, such as flowering shrubs and terrestrial bromeliads, from rivals and other hummingbirds. To conserve energy in the thin, cold alpine air of its high-elevation habitat, it frequently perches while feeding rather than hovering. Outside of brief mating encounters, there is no cohesive social structure, and individuals maintain strict independence. During the breeding season, males perform aerial displays to attract mates but play no role in nesting or rearing offspring, exhibiting a polygynous mating system. The female bears the sole responsibility for reproduction, constructing a thick, highly insulated cup-shaped nest from moss, lichens, and plant down bound together with spider silk. Often situated low to the ground in dense shrubs or rocky crevices to shield against freezing nighttime temperatures, the nest typically holds a clutch of two eggs which the female incubates and provisions alone.

Diet

The Blue-mantled Thornbill (*Chalcostigma herrani*) feeds primarily on nectar from low-growing alpine flowers and shrubs, such as those in the Ericaceae and Melastomataceae families, supplementing this sugar-rich diet with small insects and spiders for essential protein. Because it possesses an exceptionally short, needle-like bill, this hummingbird has adapted unique foraging strategies, frequently engaging in "nectar robbing" by piercing the base of long tubular flowers to steal nectar they cannot otherwise reach. To conserve vital energy in the freezing, oxygen-thin heights of its high-altitude páramo habitat, the thornbill often clings directly to vegetation or even walks on the ground while feeding rather than hovering. Additionally, it actively hunts for insects by hawking them out of the air or gleaning them from leaves, and it will aggressively defend high-quality nectar territories from rival hummingbirds.

Colors

The Blue-mantled Thornbill features a dark bronzy-olive body highlighted by a rich, indigo-blue lower back and rump. Males possess a striking rufous-and-green crown and a narrow, glittering throat iridescently grading from emerald green to fiery orange-red. Its long, deeply forked dark tail is tipped with prominent white corners, while its overall dusky, metallic plumage provides effective camouflage within its high-altitude Andean shrubland habitat.