Variable Hawk (Juvenile)

Description:

El aguilucho, águila parda, águila de pecho blanco, ñanco o pihuel (Buteo polyosoma), es una especie de ave accipitriforme de la familia Accipitridae.
De tamaño aproximado a 50 cm, con las partes inferiores claras y las superiores de color gris. La hembra se distingue por tener los hombros y parte del dorso de color canela, aunque a veces se ve ese color en los inmaduros. Se le distingue por la cola blanca con rayas delgadas negras horizontales y una banda negra subterminal en la cola.
Pasa por varias fases en su desarrollo variando en los colores entre grises, rufos y marrones

Localy known as Aguilucho (Small eagle), sometimes has colour resemblance to the Geranoaetus melanoleucus (Buzzard eagle) found in the area. The name Variable Hawk is fully deserved, as both sexes occur in several morphs. Adults of all have a white tail with a contrasting black subterminal band and grey wings barred dark (in flight from below, the remiges appear whitish with fine barring and a broad black tip). The remaining plumage varies from very dark grey to whitish, and some individuals have reddish-brown to the underparts. Females usually have a reddish-brown back, which males usually lack, although at least some males also have this.
This specimen seemed about 50cm (20 in) tall.

Habitat:

Open areas to open forest, but most likely in areas with scrub and some trees in steep terrain. Observed at heights up to around 3000 meters in the north of its range, lower down further south. Where overlapping with Puna Hawk, the form Red-backed Hawk is normally seen at lower elevation.
Distribution: South America: found in Colombia, Ecuador, Peru, Bolivia, Chile, Argentina, and Falkland Islands;vagrant to Uruguay, Brazil.

Notes:

At this altitude there are usually only condors, but here there where some eagles and some of theese, this particular bird of prey seems, to my untrained eye, a juvenile. May be a hawk or a small eagle.
They where all playing in the strong winds of the neck of this small valley.
Further ref.
http://www.avesdechile.cl/062.htm