Distinctive 15.5 cm bird strictly associated with fast-flowing streams and rivers of the Yungas, with a stocky and compact appearance and a very short tail. Overall plumage dark gray to lead-gray, slightly darker on wings and tail, with a conspicuous rufous-orange bib on the throat and upper chest. The wings show a white band formed by the base of the primaries, mainly visible during wingbeats or when performing a typical rapid downward wing movement. Bill short, straight, and black; legs relatively long, with robust tarsi and toes; strong grip in the claws allows it to cling to rocks and withstand strong currents. Possesses a well-developed nictitating membrane, protecting the eyes underwater. Sexes similar; female slightly smaller. Juvenile paler, with somewhat pinkish bill.
Distribution: Discontinuously distributed in the Andes of southern Bolivia (Tarija and Chuquisaca) and northwestern Argentina, where it inhabits the Yungas of Jujuy, Salta, Tucumán, and Catamarca, always associated with suitable watercourses. Performs altitudinal movements, descending in winter to lower areas.
Habitat: Inhabits mountain streams and rivers with cold, clear, fast-flowing waters, rocky beds, rapids, and waterfalls. Found mainly in montane Yungas forest, especially in areas with alder (Alnus acuminata), but also in ecotones with high-altitude grasslands. Prefers shaded environments and well-preserved watercourses, between 600 and 3,200 m a.s.l.
Behavior: Species strictly associated with aquatic environments. Seen alone or in pairs, moving along rocks and margins of torrents. Displays restless behavior: walks, hops, and wades in shallow water, constantly moving its tail and performing characteristic wing flicks. Feeds even by partially submerging the body or head, and may briefly dive, using its wings to remain stable against the current. Flight low, fast, and direct, generally following the course of the stream. Song infrequent, consisting of high-pitched notes followed by a warble. Calls more common, short, harsh, and nasal, often given in flight or alarm. Frequently coexists with the torrent duck, sharing habitat and habits in these extreme environments.
Diet: Feeds mainly on aquatic invertebrates (larvae and insects). Searches for food on rocks, mosses, and water margins, wading or partially submerging the body. May explore submerged leaves, especially of alder, consuming associated organisms.
Breeding: Nests between September and January. Builds a large globular nest of moss and plant fibers, with a lateral entrance, placed in crevices, rock cavities, or structures near water (including bridges), generally at low height above the torrent. Typically lays 2 white eggs. Both members of the pair participate in raising the young.
Conservation status: In Argentina it is categorized as Endangered (EN) and globally as Vulnerable (VU). It has small, fragmented, and highly localized populations (fewer than 1,000 pairs in the country). Highly sensitive to water quality, with main threats including pollution and increased turbidity, diversion and modification of watercourses, deforestation of riverbanks, overgrazing leading to erosion, and introduction of exotic species such as salmonids. Protected in Baritú, Calilegua, and Aconquija National Parks, as well as Potrero de Yala Provincial Park.
Author of this compilation: Diego Carus and María Belén Dri – 03/04/2026