Andean Emerald

Uranomitra franciae

Cali Valle Del Cauca Colombia

Quick Facts

  • Scientific Name: Uranomitra franciae
  • Spanish Name: Diamante de Francia
  • Family: Trochilidae
  • Known Nicknames: French's Emerald
  • Average Length: 9–10 cm / 3.5–3.9 in
  • Average Weight: 4.5–5.5 g / 0.16–0.19 oz
  • Wingspan: 11–13 cm / 4.3–5.1 in
  • Key Feature: Glittering blue-to-violet crown and starkly contrasting pure white underparts
  • Primary Diet: Nectarivore (Nectar and small insects)
  • Range: Andean regions of Colombia, Ecuador, and northern Peru
  • Habitat: Humid montane forest edges, clearings, and gardens
  • Social Structure: Solitary and territorial
  • Nesting/Breeding: Cup-shaped nests attached to horizontal tree branches
  • Statut de conservation : Préoccupation mineure (LC)
  • Population Trend: Stable

The Andean Emerald (*Uranomitra franciae*) is a captivating hummingbird that glimmers like a living gemstone throughout the montane forests of the Andes in Colombia, Ecuador, and Peru. Easily identified by its brilliant, snowy-white underparts that contrast sharply with its iridescent coppery-green back, this species boasts a striking violet-blue crown that adds a regal touch to its appearance. A particularly distinctive feature is its straight, slender bill, which displays a vibrant reddish lower mandible tipped with black. As an agile and energetic flyer, the Andean Emerald plays a vital role in its ecosystem by darting between floral nectar sources, using its precision hovering to feed while simultaneously acting as a key pollinator for a variety of highland plants.

Faits amusants

The Andean Emerald is a master of high-altitude logistics, often engaging in "trap-lining" where it memorizes and follows a specific circuit of flowers throughout the day like a delivery driver. Despite its delicate appearance, this hummingbird is fiercely territorial and will aggressively dive-bomb much larger birds to protect its nectar sources. To survive the freezing mountain nights, it can enter a state of torpor, drastically lowering its heart rate and body temperature to conserve energy. Its striking iridescent plumage is actually a structural illusion; the feathers contain microscopic platelets that refract light, causing the bird to shift from shimmering emerald to deep turquoise depending entirely on the angle of the sun.

Habitats et répartition

This hummingbird is primarily distributed along the Andes Mountains, spanning from Colombia through Ecuador and into northern Peru. It is most commonly found on the western slopes and within inter-Andean valleys, typically occupying elevations between 1,000 and 2,500 meters, though it occasionally ventures into slightly lower or higher zones. Its preferred habitats include the edges of humid montane forests, secondary growth woodlands, and shrubby clearings. It is also highly adaptable to human-altered environments, frequently appearing in gardens, parks, and agricultural plantations where it can find sufficient floral resources.

Comportements & Reproduction

Typically solitary and highly territorial, these birds aggressively defend nectar-rich feeding sites against competitors through sharp vocalizations and swift aerial chases. During the breeding season, males are polygynous and seek to mate with several females, attracting them with persistent, rhythmic songs from high perches. There is no stable social structure or long-term pair bonding; after copulation, the male returns to his territory, leaving the female entirely responsible for all parental duties. The female independently constructs a small, cup-shaped nest using moss, lichen, and spider silk, which is often strategically hidden in the foliage of shrubs or trees. She typically lays a clutch of two eggs and manages the incubation and feeding of the chicks without any assistance. This reproductive strategy relies on the female's camouflaged nesting and secretive behavior to ensure the survival of the brood, while the male’s aggressive defense of floral resources maintains the energy levels necessary for the population's survival.

Alimentation

The Andean Emerald primarily subsists on nectar obtained from a variety of brightly colored, tubular flowers across its montane forest habitat, favoring plant families such as Ericaceae, Gesneriaceae, and Bromeliaceae. To meet its high metabolic demands, this hummingbird often employs a strategy known as traplining, where it follows a consistent, repeatable route to visit specific flowering plants throughout the day. While nectar provides the essential carbohydrates for energy, the Andean Emerald also supplements its diet with small insects and spiders, which it catches mid-air or gleans from foliage to obtain necessary proteins and minerals. Interestingly, these birds can be highly territorial over rich nectar sources, aggressively defending productive patches of flowers from other hummingbirds to ensure a steady food supply. Their specialized long bills and rapidly beating wings allow them to hover with precision while extracting liquid, a feat that requires them to consume a significant percentage of their body weight in nectar every single day.

Couleurs

The Andean Emerald displays shimmering metallic green upperparts and a distinctive, brilliant blue or violet-blue crown. Its underparts are notably pure, snowy white from the throat to the belly, contrasting sharply with its green sides. The bird features a straight bill with a reddish lower mandible and a slightly forked, bronzy-green tail that helps it blend into lush Andean foliage.