event : evt, Due to the diversity here, there are a number of distinctions between habitat preference, primary prey types and body size among the eagle-owls of Africa. You’ll be helping to protect these owls and the habitat they depend on! The ecological purpose of their colorful eyelids are not known, however Brown (1965) opined that they replace the colorful yellow to orange eyes of eagle-owls in breeding and territorial displays, since they were very conspicuous in displaying males. As in most owls, a courtship display is both to establish mates for a newly mature pair of eagle-owls or to strength pair bonds prior to nesting. The male’s song is an exceptionally deep gwok, gwok, gwonk-gwokwokwok gwokwokwok gwonk.  From 1997 to 2005 in the same area, non-hyrax prey (each representing less than 10 out of 1550 prey items at nests) included white-tailed mongoose (Ichneumia albicauda), steenbok (Raphicerus campestris), domestic goat, vervet monkey (Chlorocebus pygerythrus), Jameson's red rock hare (Pronolagus randensis), helmeted guineafowl, Swainson's francolin (Pternistis swainsonii), Natal francolin (Pternistis natalensis), southern red-billed hornbill (Tockus rufirostris), rock pigeon (Columba livia), white-necked raven (Corvus albicollis), leopard tortoise (Stigmochelys pardalis) and giant plated lizard (Gerrhosaurus validus). In comparison, the females of the nominate subspecies of Eurasian eagle-owls and great horned owl (Bubo virginianus) are reported to average approximately 20% and 25% heavier than the males, respectively. Other fairly common, largish herons are also known to fall prey at night to Verreaux’s eagle-owl including the 873 g (1.925 lb) common egret (Ardea alba), the 1,443 g (3.181 lb) grey heron (Ardea cinerea) and the 975 g (2.150 lb) purple heron (Ardea purpurea). Verreaux's eagle (Aquila verreauxii) is a large, mostly African, bird of prey.It is also called the black eagle, especially in Southern Africa, leading to potential confusion with the Indian black eagle (Ictinaetus malayensis), which lives far to the east in Asia. Kemp, A. C. (1994) IN del Hoyo, Elliott & Sargatal. The species best represented in biomass in the prior study was the black-headed heron (Ardea melanocephala) with several adults estimated to average 1,260 g (2.78 lb) being found among the prey remains. One population of this species, in the Matobo Hills of Zimbabwe, is arguably the best studied eagle population in the world, having been subject to continuous detailed study since the late 1950s.  It is often found in dry areas with less than 60 cm (24 in) of average annual rainfall. In the Matobo Hills of Zimbabwe, the Verreaux’s eagle-owl has been considered as one of the inferred predators of 4,195 g (9.248 lb) Verreaux’s eagle (Aquila verreauxii), although whether adults or only nestlings are vulnerable is not definitely clear. No one type of bird can be said to be predictably favored as prey and any avian species unfortunate enough to have a nighttime roost or nest that happens to be in an eagle-owl’s foraging path may fall victim to this species.  Eagles nesting in the Karoo have much larger territories, though are subject to persecution and habitat change, more so than many other populations. The feathers of the upper-tail and upper-wing coverts are brown with white streaks in young birds, while the other tail and wing quills are nearly black. Brown, L. H., Gargett, V., & Steyn, P. (1977). Another study found 5 males to have averaged approximately 1,700 g (3.7 lb) while five females averaged 2,300 g (5.1 lb). Photo Gallery (11 pictures) The call of the Verreaux’s eagle-owl is the deepest of any extant owl species. On occasion, they hunt by flying low over a bush to catch prey by surprise or dash on the wing into dense foliage or through forests to catch a galago or other arboreal prey item. It is one of the most specialized species of accipitrid in the world, with its distribution and life history revolving around its favorite prey species, the rock hyraxes. By three weeks of age, the chicks down will thicken and darken to a greyish colour with some barring present. Verreaux’s eagle-owl ranges from 58 to 66 cm (23 to 26 in) in total length.  One study accumulated records of Verreaux's eagle preying on at least 100 prey species. Verreaux's Eagle-Owl, Bubo lacteus, Reuse-ooruil, Milchuhu, Blaßuhu, Bufo-leitoso, Grand-duc de Verreaux, Verreaux-oehoe, Giant Eagle Owl ~ Kgalagadi Transfrontier Park With simmer temperatures into the 40's C, one often finds owls on the ground next to the bole of threes where it seems to be a bit cooler.  Due to the formidable range of competitors it pays for Verreaux's eagle to be cautious from the moment it bears down on its prey. I might never have heard of it since it only resides in Africa. This is the second broadest size range positively attributed to a single owl species for prey items after the Eurasian eagle-owl and the largest exceptional upper prey-size also after the Eurasian species. As is commonly the case with eagle-owls, the Verreaux’s eagle-owl is perhaps the most serious predatory threat to diurnal raptors in its range, most often ambushing raptors on their prominent nests upon nightfall and freely killing birds of prey of any age from nestlings to adults.  A handful of nests in South Africa have even been on electric pylons.