Cape eagle-owl

The Cape eagle-owl (Bubo capensis) is a significant avian species belonging to the Strigidae family and is one of the larger members of the eagle-owl genus, Bubo. It is primarily found in the southernmost regions of southern Africa and extends into parts of East Africa. Claims of its presence in the southern Arabian Peninsula are considered erroneous, likely due to confusion with other species.

Habitat and Distribution

This owl predominantly inhabits mountainous or hilly areas characterized by rocks, where it finds suitable roosting locations. Its habitat also encompasses adjacent woodlands, grasslands, and wooded gullies. The species can be found from sea level up to elevations of 2,500 meters. In some instances, Cape eagle-owls have been observed venturing into human settlements and towns, often to hunt pigeons.

Physical Characteristics

The Cape eagle-owl is a large bird, positioned between other large Bubo owl species in size. Its total length typically ranges from 46 to 61 cm. The plumage is dark brown above, with distinctive prominent ear-tufts and striking yellow to yellowish-orange eyes. Its underside is also dark, featuring a paler chest overlaid with a complex pattern of white, black, and tawny-fulvous markings, with the sides of the breast exhibiting blotchy brown. The facial disc is fulvous-brown, bordered by a dark frame that becomes broader near the neck. Both the tail and wing feathers are barred with alternating light and dark brown. The toes and tarsi are densely feathered.

Behavior and Diet

As a nocturnal species, the Cape eagle-owl roosts during the day in sheltered rock ledges, large rock crevices, caves, or sometimes in trees or on the ground amongst dense vegetation. They have occasionally been found roosting in urban areas like Johannesburg and Pretoria. Their diet is primarily composed of mammals, ranging from small rodents to animals larger than themselves, such as hyraxes. They also prey on other birds, reptiles, amphibians, scorpions, crabs, and large insects. Mole rats are a particularly favored food source in some areas.

Vocalizations and Reproduction

The vocalizations of the Cape eagle-owl are distinctive. The male emits a powerful, explosive hoot followed by a faint note, described as 'boowh-hu'. The female's call is similar but slightly higher in pitch, and pairs sometimes engage in duets. During courtship rituals, the male performs a bowing display accompanied by a trisyllabic call. Young owls and females produce a nasal, drawn-out 'chrrreeh' when begging for food, while females may cluck when offering sustenance. Alarm calls consist of a barking 'wack wack wack'.

Nesting typically involves a shallow scrape in a sheltered location, such as a rock ledge, crevice, or cave, or on the ground under dense bushes. Rarely, they may utilize existing large stick nests or the tops of bushes. The breeding cycle usually occurs annually, though sometimes in alternate years. A clutch typically consists of two white eggs, though one or three may be laid. The female incubates the eggs for 34 to 38 days, during which the male provides her with food. The young hatch at intervals of up to four days. Both parents care for the chicks, which become capable of flight by 70–77 days and are cared for a total of six months, reaching sexual maturity the following year.

Conservation Status

The Cape eagle-owl is classified by the IUCN as 'Least Concern.' This status reflects its relatively large geographic range and apparently stable population numbers. Despite this classification, nests, particularly those on the ground, are subject to predation, and individuals can be victims of roadkills or electrocution from power lines. The use of rodenticides may also pose an indirect threat to the species.