The Lazuline Sabrewing (*Campylopterus falcatus*) is a dazzling hummingbird endemic to the humid montane forests of Costa Rica and western Panama, named for its most extraordinary feature: the male's deeply curved, sabre-like outer wing feathers that produce a metallic, whirring sound during flight. Its general appearance is striking, with the male sporting a brilliant, iridescent turquoise-blue throat and chest that transitions into a deep violet-blue belly, contrasting sharply with a dark green back, white-tipped tail feathers, and a long, decurved black bill. A special trait is its energetic, insect-like hovering as it feeds on tubular flowers, while its loud, sharp *tsik* call and rapid wingbeats make it a vivid and memorable presence in the cloud forest understory.

Faits amusants

Despite its dazzling emerald and violet plumage, the Lazuline Sabrewing is a master of aggressive stealth; males will ambush other hummingbirds from hidden perches, using their uniquely curved, sabre-like outer wing feathers to produce a sharp, metallic *whirring* sound during territorial displays. It is one of the few hummingbirds that regularly consumes small spiders, actively plucking them from webs rather than just snatching insects in mid-air. During the breeding season, the male performs a pendulum-like courtship dive, swinging back and forth in a deep U-shape before a perched female, with his throat feathers flaring into a brilliant azure gorget that seems to flash like a strobe light.

Habitats et répartition

The Lazuline Sabrewing inhabits humid montane forests, cloud forests, and forest edges, often in areas with dense undergrowth and abundant epiphytes. It is typically found at elevations between 800 and 2,200 meters, favoring regions with a high moisture level, such as ravines and slopes near streams. Its geographical range is restricted to the northern Andes, occurring from western Venezuela through the eastern slopes of the Colombian Andes, and extending into northern Ecuador and the extreme northern tip of Peru.

Comportements & Reproduction

The Lazuline Sabrewing is typically solitary, with males defending feeding territories rich in nectar-producing flowers, often perching conspicuously to guard these resources. During the breeding season, males perform elaborate aerial courtship displays, including steep dives and U-shaped flight patterns, to attract females; they do not participate in nesting or parental care. Females build a small cup-shaped nest of plant fibers and spiderwebs, usually on a horizontal branch, where they lay two white eggs. Incubation lasts about 15–18 days, and the female alone feeds the chicks regurgitated nectar and insects until fledging, a strategy common among hummingbirds that maximizes male reproductive output. No unique reproductive strategies beyond typical hummingbird polygyny have been documented for this species.

Alimentation

The Lazuline Sabrewing is a nectarivorous hummingbird, with its diet consisting almost entirely of the sugary nectar from a variety of tubular flowers, which it accesses using its long, curved bill and specialized tongue. An interesting fact is that this species is known to favor the flowers of Heliconia plants and certain epiphytic bromeliads, often hovering or perching to feed. Unlike many hummingbirds, it has also been observed regularly supplementing its diet with small insects and spiders, which it gleans from foliage or catches in mid-air, providing essential protein and nutrients, particularly during the breeding season and for molting.

Couleurs

The Lazuline Sabrewing is a striking hummingbird with a deep, iridescent blue-violet body that shifts to a brighter sapphire on the throat and crown. Its most unique feature is the sharply curved, black bill and the long, stiffened outer wing feathers that form a "sabre" shape. The underparts are a contrasting pale gray to white, and the tail is a dark, glossy blue-black with white tips on the outer feathers, lacking camouflage adaptations as its brilliant colors are for display.