Overview
The Blue-throated Hillstar (Oreotrochilus cyanicollis) is an extraordinarily rare hummingbird formally discovered in 2017 and described in 2018 from the frigid, windswept alpine páramo of southwestern Ecuador. Living at elevations where freezing nightly temperatures and thin air deter almost all other avian life, this high-altitude specialist stands out among hillstars due to the male’s glittering ultramarine throat gorget, snow-white breast, and solitary dependence on hardy native orange flowering composite shrubs.
Biology and Physical Characteristics
Male Blue-throated Hillstars display an astonishing plumage combination: a luminous, iridescent blue throat gorget outlined by a crisp black border that contrasts boldly against silky white underparts with a narrow black mid-ventral stripe. Their curved, stout bills are adapted to pierce the tough orange bracts of Chuquiraga chuquiragua blossoms. To survive bone-chilling alpine nights when ambient temperatures drop well below freezing, these hummingbirds drop their core body temperature and heart rate drastically, entering a nightly metabolic dormancy known as torpor while tucked safely inside sheltered rock crevices.
Behavior and Ecology
Because alpine winds in the páramo are relentless and nectar-rich flowers grow low to the rocky ground, Blue-throated Hillstars frequently perch directly on twigs while feeding rather than expending vast energy hovering. They maintain strictly defended feeding territories centered on isolated patches of Chuquiraga bushes, violently chasing off rival males and larger mountain caracaras. Females construct cup-shaped nests beneath overhanging cliff roofs and inside caves, insulating the exterior with thick moss and lichens to shield eggs from hail and frost.
Conservation and Human Impact
Assessed as Critically Endangered by the IUCN, the Blue-throated Hillstar has an extremely tiny breeding range estimated at less than 100 square kilometers, with a total global population numbering fewer than 110 mature individuals. Ongoing burning of alpine páramo to promote fresh pasture grass for cattle, open-pit gold mining concessions, and extensive pine plantation monocultures threaten to wipe out the remaining shrubs upon which the species depends. Ecuadorian conservation organization Fundación Jocotoco established the Cerro de Arcos Nature Reserve to secure vital nesting canyons.
Interesting Factoid
The Blue-throated Hillstar roosts exclusively deep inside dark rocky caves and canyon crevices at night, entering a state of suspended animation to survive nightly temperatures below 0°C at 12,000 feet elevation.
Last updated: October 2026