White-sided Hillstar

Common name: White-sided Hillstar
Scientific name: Oreotrochilus leucopleurus
Clades: Lesbiini - Coquettes

The White-sided Hummingbird is a remarkable member of the genus Oreotrochilus, and it is noteworthy that the White-sided Hillstar boasts the largest geographical range within this group. This species can be found throughout the diverse landscapes of southern Bolivia, extending as far south as the picturesque regions of southern Argentina, occupying high-altitude habitats that range between at least 1,200 and 4,000 meters above sea level, and at times even reaching elevations as high as the snowline. Despite its tough and resilient nature that allows it to thrive in these harsh environments, observations indicate that at least some individuals tend to leave Chile during the colder months of the austral winter. In terms of plumage, the White-sided Hillstar exhibits a strikingly similar appearance to that of the Andean Hillstar (Oreotrochilus estella), with which it forms a superspecies. Its feathers are predominantly bronzy-green on the upper side and showcase a bright white underbelly. Males are particularly distinguished by their striking green throats, while females display a gray-spotted throat, providing a subtle contrast. Both sexes are also characterized by their extensive white markings in their otherwise dark tails, adding to their visual appeal.