Paul D Stewart / Illustration of Giant Octopus (Octopus dofleini) attacking a ship, 1815 copperplate engraving from Bertuch's 'Bilderbuch fur kinder' 16 plate 5. with contemporary colour. 'Colosal Polypus' (octopus) a...

Roland Seitre / Peters's Angola Colobus (Colobus angolensis palliatus) in tree, native to Africa

Roland Seitre / Peters's Angola Colobus (Colobus angolensis palliatus) covered in pollen, native to Africa

Guy Edwardes / Blue waxbill (Uraeginthus angolensis) perched on branch. Savuti, Chobe National Park, Botswana.

Christophe Courteau / The Kunene River is the natural border between Namibia (south) and Angola (north). The Kunene River stops the sand dunes coming from the south, pushed by the strong wind. Skeleton Coast National Park,...

Christophe Courteau / Kunene River, northern border of Namibia with Angola. Epupa Falls, Kaokoland, Kunene Province, Namibia

Christophe Courteau / Epupa Falls, Kunene River, northern border of Namibia with Angola. Kaokoland, Kunene Province, Namibia

Christophe Courteau / Epupa Falls, Kunene River, northern border of Namibia with Angola. Kaokoland, Kunene Province, Namibia

Philippe Clement / Snowy-crowned robin-chat / snowy-headed robin-chat (Cossypha niveicapilla) perched in tree, native to tropical forests in Africa. Captive. Digital composite

Philippe Clement / Snowy-crowned robin-chat / snowy-headed robin-chat (Cossypha niveicapilla) perched in tree, native to tropical forests in Africa. Captive. Digital composite

Philippe Clement / Black-casqued hornbill / black-casqued wattled hornbill (Ceratogymna atrata) male and female pair perched in tree, native to Africa. Captive. Digital composite

Philippe Clement / Black-casqued hornbill / black-casqued wattled hornbill (Ceratogymna atrata) male perched in tree, native to Africa. Captive. Digital composite

Ann & Steve Toon / Blue waxbills (Uraeginthus angolensi) at water, Zimanga private game reserve, KwaZulu-Natal, South Africa.

Ann & Steve Toon / Blue waxbills (Uraeginthus angolensi) and redbilled firefinches (Lagonosticta senegala) at water, Zimanga private game reserve, KwaZulu-Natal, South Africa.

Loic Poidevin / Woodland kingfisher (Halcyon senegalensis) on a branch, Masai Mara, Kenya.

Richard Du Toit / Woodland kingfisher (Halcyon senegalensis) Kruger National Park, South Africa;

Nature Production / Elephantfish (Campylomormyrus tshokwe) native to Democratic Republic of the Congo and Angola

Ann & Steve Toon / Blue waxbills (Uraeginthus angolensis), Zimanga private game reserve, KwaZulu-Natal, South Africa, June

Christophe Courteau / Fashion items worn by a female from the Himba Community. Northern Kaokoland. Namibia. The shells come from the Atlantic Coast of Angola.

Wim van den Heever / Blue waxbill (Uraeginthus angolensis) taking a bath, Zimanga Private Game Reserve, South Africa

Eric Baccega / Marienfluss valley during dry season, Kaokoland, at the frontier, the mountains are Angola, Kunene region, Namibia, Africa

Ann & Steve Toon / Blue waxbill (Uraeginthus angolensis) at water, Zimanga private Game Reserve, KwaZulu-Natal, South Africa, May

Neil Aldridge / Woodland kingfisher (Halcyon senegalensis) perched in woodland, on the banks of the Letaba River, Kruger National Park, South Africa.

Neil Aldridge / Woodland kingfisher (Halcyon senegalensis) perched in woodland on the banks of the Letaba River, Kruger National Park, South Africa.

Neil Aldridge / Woodland kingfisher (Halcyon senegalensis) perched in woodland on the banks of the Letaba River, Kruger National Park, South Africa.

Neil Aldridge / Woodland kingfisher (Halcyon senegalensis) flying from its nest hole in tree, Shingwedzi River, Kruger National Park, South Africa.

Neil Aldridge / Woodland kingfisher (Halcyon senegalensis) perched in Acacia woodland on the banks of the Luvuvhu River, Kruger National Park, South Africa.

Philippe Clement / Western lowland gorilla (Gorilla gorilla gorilla) silverback male in indoor enclosure, Cabarceno Park, Cantabria, Spain. Captive, occurs in Cameroon, the Central African Republic, Congo, Gabon, Equato...

Philippe Clement / Western lowland gorilla (Gorilla gorilla gorilla) silverback male in indoor enclosure, Cabarceno Park, Cantabria, Spain. Captive, occurs in Cameroon, the Central African Republic, Congo, Gabon, Equato...

Philippe Clement / Western lowland gorilla (Gorilla gorilla gorilla) baby riding on mother's back, Cabarceno Park, Cantabria, Spain. Captive, occurs in Cameroon, the Central African Republic, Congo, Gabon, Equatorial Gu...

Denis-Huot / Red-crested Turaco (Tauraco erythrolophus) captive at zoo. Endemic to western Angola.

Denis-Huot / Red-crested Turaco (Tauraco erythrolophus) captive at zoo. Endemic to western Angola.

Will Burrard-Lucas / Woodland Kingfisher (Halcyon senegalensis) from behind with wings spread, South Luangwa National Park, Zambia. April.

Mike Wilkes / Woodland Kingfisher (Halcyon senegalensis) perched in tree, Serengeti, Tanzania.

Enrique Lopez-Tapia / Epupa falls on the Kunene river, on the border between Namibia and Angola. Kaokoland, Namibia, September 2013.

Enrique Lopez-Tapia / Epupa falls on the Kunene river, on the border between Namibia and Angola. Kaokoland, Namibia, September 2013.

Enrique Lopez-Tapia / Epupa falls on the Kunene river, on the border between Namibia and Angola. Kaokoland, Namibia, September 2013.

Roland Seitre / Red-crested turaco (Tauraco erythrolophus) singing, captive, endemic to Western Angola.

Roland Seitre / Red-crested turaco (Tauraco erythrolophus) bathing, captive, endemic to Western Angola.

Roland Seitre / Red-crested turaco (Tauraco erythrolophus) bathing, captive, endemic to Western Angola.

Roland Seitre / Red-crested turaco (Tauraco erythrolophus) captive, endemic to Western Angola.

Roland Seitre / Red-crested turaco (Tauraco erythrolophus) captive, endemic to Western Angola.

Roland Seitre / Peter's Angolan Colobus Monkey (Colobus angolensis palliatus) in tree, Ukunda, Kenya.

Roland Seitre / Portrait of Peter's Angolan Colobus Monkey (Colobus angolensis palliatus) with closed eyes. Ukunda, Kenya.

Roland Seitre / Peter's Angolan Colobus Monkeys (Colobus angolensis palliatus). Ukunda, Kenya.

Roland Seitre / Portrait of Peter's Angolan Colobus Monkey (Colobus angolensis palliatus). Ukunda, Kenya.

Roland Seitre / Welcome sign at Diani Beach, illustrated with painting of a Colobus Monkey. Ukunda, Kenya.

Roland Seitre / Antelope snares on display at the Colobus Trust, Primate Conservation Research and Rescue information centre. Ukunda, Kenya.