Sapphire-spangled Emerald

En bref

  • Scientific Name: Amazilia lactea
  • Spanish Name: Zafiro coliazul
  • Famille : Trochilidae
  • Known Nicknames: Sapphire-spangled Emerald Hummingbird
  • Average Length: 8–9 cm / 3.1–3.5 in
  • Average Weight: 4–5.5 g / 0.14–0.19 oz
  • Envergure : N/A
  • Key Feature: Iridescent blue-green throat and chest with glittering sapphire spots
  • Primary Diet: Primarily Nectarivore
  • Range: Eastern and central South America (Brazil, Bolivia, Paraguay, northern Argentina)
  • Habitat: Tropical and subtropical forests, woodlands, and gardens
  • Structure sociale : Solitaire
  • Nesting/Breeding: Small cup-shaped nest in tree fork
  • Statut de conservation : Préoccupation mineure (LC)
  • Évolution démographique : Stable

The Sapphire-spangled Emerald (*Amazilia lactea*) is a dazzling jewel of the hummingbird world, named for the brilliant, iridescent sapphire-blue spots that spangle its throat and chest, contrasting starkly with its otherwise shimmering emerald-green body and coppery-bronze tail. This small, agile bird, found in the forests and gardens of South America, possesses a distinctive, slightly decurved black bill tipped with red, a unique feature that aids in sipping nectar from specific tubular flowers. Its most special feature is the way its throat feathers flash from deep violet to fiery blue depending on the light, creating a living, moving gemstone effect as it hovers with remarkable precision, its wings a blur of iridescence.

Faits amusants

Despite its jewel-like name, the sapphire-spangled emerald is a master of aggressive bluffing, often performing high-speed aerial charges at much larger birds like toucans or hawks to defend its feeding territory, then veering away at the last second. Its tongue is uniquely adapted with a brush-like tip to lap up nectar from deep, narrow flowers, and it can enter a state of torpor on cold nights, dropping its body temperature by over 20°C to conserve energy. Males also perform a bizarre “pendulum” display, swinging back and forth in a tight arc mid-air while making a sharp, metallic *tink* sound with their tail feathers.

Habitats et répartition

The Sapphire-spangled Emerald primarily inhabits humid and semi-humid lowland forests, forest edges, secondary growth, and cultivated areas such as coffee plantations and gardens. It is found from sea level up to around 1,200 meters in elevation. Its geographical range spans across much of northern and central South America, including the Amazon Basin in Brazil, Bolivia, Peru, Ecuador, Colombia, Venezuela, the Guianas, and extending into the cerrado and pantanal regions of central Brazil.

Comportements & Reproduction

The Sapphire-spangled Emerald is typically solitary outside of breeding, with males defending small feeding territories rather than nesting sites. Courtship involves the male performing a U-shaped display flight in front of a perched female, rapidly beating his wings to produce a loud, buzzing sound. After mating, the female alone constructs a small cup-shaped nest using plant down and spider webs, often on a horizontal branch. She lays two white eggs and incubates them for about 14–15 days, then feeds the chicks regurgitated nectar and small insects. The young fledge after roughly 20–22 days. A unique reproductive strategy is that females may initiate a second brood while still feeding the first fledglings, overlapping cycles to maximize output in favorable conditions.

Alimentation

The Sapphire-spangled Emerald is primarily a nectarivore, feeding on the sugary nectar from a variety of flowering plants, trees, and shrubs, often favoring tubular blossoms like those of *Inga* and *Erythrina* species. To supplement its high-energy diet, it also consumes small insects and spiders, which it catches in flight or gleans from foliage, providing essential protein and nutrients for growth and reproduction. Interestingly, this hummingbird exhibits a specialized feeding behavior known as "trap-lining," where it visits a specific sequence of flowers along a regular route, efficiently maximizing nectar intake while minimizing energy expenditure. Additionally, its long, forked tongue can extend deep into flowers to access nectar, and it may occasionally sip tree sap or consume pollen as a minor dietary component.

Couleurs

The Sapphire-spangled Emerald displays a vibrant, metallic emerald-green body with a brilliant, glittering sapphire-blue throat and upper chest, often appearing as scattered spangles. Its underparts are a paler, whitish-green, and the forked tail is dark blue-black. This hummingbird lacks specific camouflage adaptations, instead relying on its iridescent colors to flash and disappear against dappled forest light.