Grey-flanked Cinclodes

Identification

The grey-flanked cinclodes is a small member of the ovenbird family, measuring 17 to 18 cm long and weighing between 22 to 31 grams. It is characterized by a medium-length, slightly decurved bill and a distinctive plumage pattern. The nominate subspecies displays a buff supercilium with speckles at its front, blackish-brown lores and ear coverts, and a whitish malar area with dark scallops. The crown is dark grayish-brown while the upperparts are rich dark brown, with rufous tones visible across the base of the flight feathers and on the tail's outer feathers.

The underparts show a white throat with dark scallops at its base, transitioning to a dull dark gray-brown breast with pale spots above and streaks below. The belly is paler and browner with a white center, while the flanks and undertail coverts are rich dark brown with some whitish feather tips. The sexes share identical plumage. The iris is dark brown to black, the bill blackish or blackish horn, and the legs and feet are blackish-brown. The other two subspecies show variations: C. o. hornensis is less richly colored with darker gray upperparts, while C. o. baeckstroemii adds a rufous tinge to the sides and flanks.

Range & Habitat

The grey-flanked cinclodes is endemic to South America, found in Argentina and Chile. The nominate subspecies occurs on the mainland from Chile's Antofagasta Region and western Argentina's Mendoza Province southward to the Strait of Magellan. Subspecies C. o. hornensis inhabits Chile's Desolación Island, Tierra del Fuego (both Chilean and Argentine sectors), and the Cape Horn Archipelago, while C. o. baeckstroemii is restricted to Alejandro Selkirk Island in the Juan Fernández Archipelago.

This species favors open grassy and rocky landscapes, with a particular affinity for montane areas near streams. Its elevational range extends from sea level to 4,200 meters, making it adaptable to diverse terrain throughout its range.

Behaviour & Diet

The grey-flanked cinclodes is primarily a year-round resident throughout most of its range, though individuals move to lower elevations during winter months. Subspecies C. o. hornensis exhibits partial migration, with some birds moving north onto the mainland following the breeding season. The species feeds on arthropods and presumed invertebrates, foraging singly or in pairs by gleaning prey directly from the ground, mud, and rocks.

Breeding occurs during the austral spring and summer, with activity documented through at least October. The species is assumed to be monogamous and nests in burrows excavated at the end of tunnels in earth banks, often along streamside locations. Nest chambers are lined with plant fibers and hair, and clutches typically contain two eggs. The species produces a distinctive song described as "a fast dry twittery trill rising in pitch, introduced by a few single notes," along with a dry "tsick" call.

Best Time & Places to See It

The grey-flanked cinclodes is considered uncommon to fairly common throughout its range. It is most reliably encountered during the austral spring and summer breeding season (including October onward), when birds are more vocal and active. The species' preference for open, rocky, and grassy landscapes with minimal human disturbance makes it most likely to be found in relatively undisturbed terrain.

Mountainous regions with streams and watercourses are particularly productive, as the species often forages near water. The wide elevational range means that suitable habitat exists from sea level to high mountain passes, though visitors should focus their search on areas matching these microhabitat preferences rather than expecting to find the species in closed vegetation or heavily disturbed zones.

Photography Tips

Photographing the grey-flanked cinclodes requires patience and attention to habitat. The bird's small size and cryptic plumage blend well with rocky and grassy terrain, so slow, careful movement through open areas is essential. Early morning and late afternoon often provide the best lighting for capturing the bird's subtle plumage details, particularly the rich dark brown upperparts and distinctive facial markings.

Since the species forages on the ground and gleaning from rocks and mud, positioning yourself low and still near suitable habitat may yield opportunities. The bird's habit of vocalizing during breeding season makes sound an invaluable aid in locating individuals. Focus on capturing the distinctive buff supercilium, facial pattern, and the contrasting pale breast spotting to document this understudied species for scientific and travel documentation purposes.