Buteo poecilochrous

The Puna Hawk is a medium-sized raptor, with adults typically measuring 45 to 55 centimeters in length and boasting a wingspan of about 120 to 140 centimeters. Its plumage is predominantly dark brown, accented with lighter mottling on the underparts and a distinctive pale band across the tail. These features make it unmistakable when compared to other high-altitude raptors. Juveniles often exhibit a more mottled appearance, with more extensive white markings on their underparts, gradually acquiring the adult coloration as they mature. There is little sexual dimorphism in Puna Hawks, meaning males and females look quite similar, though females are generally slightly larger. When perched, Puna Hawks maintain a regal stance, often with their wings slightly drooped. In flight, they are easily recognized by their broad, rounded wings and relatively short tail. Their flight silhouette is similar to that of the more widespread Red-tailed Hawk but is differentiated by their unique tail banding and habitat preference. This species can sometimes be confused with the Variable Hawk, which shares overlapping ranges, but the Puna Hawk's darker plumage and specific banding patterns are key distinguishing features.

The diet of the Puna Hawk primarily consists of small mammals, with rodents being the most frequent prey. These hawks have adapted to hunting in open grasslands where they can easily spot and swoop down on their prey. Their foraging technique involves soaring at moderate heights, using their keen vision to detect movement below. Once a target is identified, they execute a swift and precise dive. During periods when mammalian prey is scarce, Puna Hawks may also hunt small birds and occasionally reptiles. Seasonal variations in diet are influenced by prey availability, with a greater reliance on alternative food sources outside the primary rodent breeding season. The size of their prey typically ranges from small rodents to medium-sized birds, with larger prey occasionally taken when necessary. Puna Hawks primarily hunt during daylight hours, taking advantage of the thermal currents for soaring.

Puna Hawks exhibit a largely solitary lifestyle, except during the breeding season when they form monogamous pairs. These pairs establish territories and defend them vigorously against intruders. Courtship involves aerial displays, with males performing impressive dives and loops to attract females. These displays are critical for pair bonding and territory establishment. Outside of the breeding season, Puna Hawks may be seen alone or in pairs, but they do not form large flocks. Their response to potential threats is typically assertive, with both vocal and aerial displays used to deter predators or rival hawks. Daily activity patterns are largely dictated by environmental conditions, with peak activity occurring during the warmer parts of the day when thermal currents are strongest, facilitating efficient soaring and hunting.

Puna Hawks construct their nests on rocky ledges or occasionally in isolated bushes or trees when available. Nests are composed of sticks and lined with softer materials such as grasses and feathers to provide insulation against the cold. Clutch size typically ranges from one to three eggs, with two being the most common. The female primarily undertakes incubation duties, lasting around 30 to 35 days, while the male provides food. Once hatched, the chicks remain in the nest for approximately 45 to 50 days before fledging. Parental roles are clearly defined, with both parents involved in feeding and protecting the young. Generally, Puna Hawks raise one brood per year, though in some cases where conditions are favorable, a second brood may be attempted.

The primary call of the Puna Hawk is a series of high-pitched, piercing whistles, often described as 'klee-klee-klee.' This call is used primarily during the breeding season for territory defense and communication between mates. Alarm calls are sharper and more intense, serving as warnings to intruders or potential predators. During the dawn chorus, Puna Hawks may become particularly vocal, using their calls to establish presence in their territory. The tonal quality of their calls is reminiscent of other Buteo species but is distinct in its higher pitch and rapid delivery.

• 1The Puna Hawk's range is limited to the high-altitude grasslands of the Andes, making it a true specialist in this unique ecosystem.
• 2Despite harsh conditions, Puna Hawks are known for their adaptability, thriving at elevations exceeding 4000 meters.
• 3The Puna Hawk's diet primarily consists of rodents, but it can shift to birds and reptiles when needed.
• 4Puna Hawks engage in impressive aerial courtship displays involving dives and loops to attract mates.
• 5With a wingspan of up to 140 centimeters, the Puna Hawk is well-adapted for soaring over open grasslands.
• 6Juvenile Puna Hawks differ from adults with more extensive white mottling, allowing for easier identification.
• 7Nest construction involves both partners, with the male collecting materials and the female arranging them.

Currently, the Puna Hawk is classified as Least Concern by the IUCN. Its population is considered stable, with no significant declines reported across its range. However, primary threats include habitat degradation due to agriculture expansion and climate change, which could affect prey availability and suitable nesting sites. Conservation efforts focus on habitat preservation and monitoring population trends to ensure their long-term viability. Historically, the Puna Hawk has maintained a steady presence in its native range, benefiting from the relative remoteness and inaccessibility of much of its habitat.