The southern ground hornbill (Bucorvus leadbeateri) is one of two species of ground hornbill, both of which are found solely within Africa, and is the largest species in the hornbill order worldwide. It can be found in the southern regions of Africa, ranging from Kenya to South Africa. Within these regions, they inhabit both woodlands and savannas. The other species of the genus Bucorvus is the Abyssinian ground hornbill, B. abyssinicus.
Southern ground hornbills are carnivorous and hunt mostly on the ground. Their food ranges from insects to small vertebrates. Their nests are often found in high tree cavities or other shallow cavities, such as rock holes in cliff faces. These birds are a long-lived species, having lifespans in the range of 50–60 years, and up to 70 in captivity. In relation to their long lives, they do not reach sexual maturity until 4–6 years old, and begin breeding around 10 years old. Their sex can be identified by the colour of their throats: the male's is pure red and the female's is a deep violet-blue.
Southern ground hornbills are a culturally pervasive and important species in southern Africa. Kruger National Park, located within South Africa, lists southern ground hornbills as one of their 'Big Six' bird species.[6] However, their numbers have been declining, due in part to persecution, habitat destruction, cultural beliefs, and other factors. They are listed globally as 'Vulnerable' by the IUCN as of 2018, and as 'Endangered' in South Africa, Lesotho, Namibia and Eswatini.
Southern ground hornbill groups are very vocal: contact is made by calls in chorus which can usually be heard at distances of up to 3 kilometres (1.86 mi). The calls allow each group to maintain its territory, which must be as large as 100 square kilometres (40 sq mi) even in the best habitat.
Southern ground hornbills can be found from northern Namibia and Angola to northern South Africa and southern Zimbabwe to Burundi and Kenya. They require a savanna habitat with large trees for nesting and dense but short grass for foraging.
This is a large bird, at 90 to 129 cm (2 ft 11 in to 4 ft 3 in) long. Females weigh 2.2 to 4.6 kilograms (4.9 to 10.1 lb), while the larger males weigh 3.5 to 6.2 kilograms (7.7 to 13.7 lb).[citation needed] The average weight of eight females was 3.34 kg (7.4 lb) whilst that of eight males was 4.2 kg (9.3 lb); thus they average around 35% percent heavier than any Asian hornbill species.[9] Wingspan is from 1.2 to 1.8 m (3 ft 11 in to 5 ft 11 in). The wing chord is 49.5 to 61.8 cm (19.5 to 24.3 in), the tail from 29 to 36 cm (11 to 14 in), the tarsus from 13 to 15.5 cm (5.1 to 6.1 in) and the culmen from 16.8 to 22.1 cm (6.6 to 8.7 in). Stevenson and Fanshawe report that the Abyssinian ground hornbill is the larger species on average, at 110 cm (43 in), than the southern species, at 102 cm (40 in), but published maximum weights and standard measurements indicate the southern species is slightly larger. Average weights are not known for the Abyssinian species.
The southern ground hornbill is black with vivid red patches of bare skin on the face and throat (yellow in juvenile birds)—as well as being one of few birds with eyelashes—which are believed to keep dust out of the birds' eyes while they forage during the dry season. The white tips of the wings (primary feathers) seen in flight are another diagnostic characteristic. The beak is black and slightly curved and presents a casque, more developed in males. Female southern ground hornbills are smaller and have violet-blue skin on their throats. Juveniles to six years old lack the prominent red pouch, having a duller patch of grey in its place.
