Overview
The Mountain Avocetbill (Opisthoprora euryptera) is a singular, highly specialized hummingbird endemic to the frigid, mist-enshrouded dwarf elfin forests and sub-páramo scrub of the tropical high Andes. Occupying steep mountain slopes between 2,400 and 3,600 meters in elevation, this hardy bird is instantly recognized by its bizarre, distinctly upturned (recurved) bill, an evolutionary novelty among hummingbirds that allows it to exploit nectar sources inaccessible to standard straight-billed species.
Biology and Physical Characteristics
Opisthoprora euryptera features a robust, cold-tolerant body cloaked in shimmering bronzy-green dorsal plumage that transitions into a deeply notched, iridescent blue-black tail with crisp white outer feather tips. Its underparts are densely spotted with olive-green spangles over a creamy-white base. Behind each eye rests a prominent white post-ocular spot. Its most distinctive characteristic is its short, stout black bill, which curves distinctly upward at the tip, mirroring the bill shape of wading avocets.
Behavior and Ecology
Rather than hovering inside the throats of conventional open flowers, the mountain avocetbill employs its recurved bill to pierce or ‘rob’ nectar from the bases of thick, bell-shaped Ericaceae flowers and pendent corollas. Inserting its upturned bill directly into the base of the blossom, it siphons rich nectar without pollinating the plant. To survive freezing nighttime temperatures in the high Andes, it enters profound physiological torpor, plummeting its metabolic rate and core body temperature to match ambient mountain air.
Conservation and Human Impact
The IUCN classifies Opisthoprora euryptera as Least Concern due to its continuous, stable distribution across the upper slopes of the Andes and its ability to utilize secondary scrub, forest edges, and regenerating landslide gullies. Key conservation measures focus on protecting high-Andean watershed reserves and preventing burning of fragile páramo ecotones.
Interesting Factoid
Unlike almost all other hummingbirds whose bills curve downward or remain stick-straight, the Mountain Avocetbill has an upturned beak like a miniature crowbar, which it uses to crack open and steal sweet nectar from flowers that are sealed shut!
Last updated: October 2026