Hippo (Hippopotamus amphibius) with calf, Chobe National Park, Botswana, Africa

Hippopotamus (Hippopotamus amphibius), Okavango Delta, Botswana, Africa

Hippopotamus (Hippopotamus amphibius) in the river Khwai, Okavango Delta, Botswana, Africa

Hippopotamus (Hippopotamus amphibius) in the river Khwai, Okavango Delta, Botswana, Africa

Hippopotamuses (Hippopotamus amphibius) in the river Khwai, Okavango Delta, Botswana, Africa

Grey heron (Ardea cinerea), hippo (Hippopotamus amphibius), water cabbage (Pistia stratiotes), South Luangwa, Zambia, Africa

Hippopotamus (Hippopatamus amphibius) on the sandy bank of a river, adult, Kruger National Park, South Africa, Africa

Hippopotamus (Hippopatamus amphibius) on the sandy bank of a river, adult, Kruger National Park, South Africa, Africa

Hippopotamus (Hippopotamus amphibius), Luangwa River, South Luangwa National Park, Zambia, Africa

Hippopotamus (Hippopotamus amphibius) relaxing on another hippo, humor, Luangwa River, South Luangwa National Park, Zambia, Africa

Hippo (Hippopotamus amphibius), grazing in shallow water, open mouth, Moremi Wildlife Reserve, Ngamiland, Botswana, Africa

Hippo (Hippopotamus amphibius) in the swamp area, Okavango Delta, Botswana, Africa

Hippo (Hippopotamus amphibius) bathing in mud, animal portrait, Queen Elisabeth National Park, Uganda, Africa

Hippopotamus (Hippopatamus amphibius) entering the river, adult, Kruger National Park, South Africa, Africa

Hippopotamus (Hippopotamus amphibius) and red buffalo or forest buffalo (Syncerus nanus) on the beach, Petit Loango, Loango National Park, Parc National de Loango, Ogooué-Maritime Province, Gabon, Africa

Hippopotamus (Hippopotamus amphibius) disappearing into the Atlantic Ocean, Surfing Hippos, Petit Loango, Loango National Park, Parc National de Loango, Ogooué-Maritime Province, Gabon, Africa

Hippopotamus (Hippopatamus amphibius), adult, in water, threatening, yawning, Saint Lucia Estuary, Isimangaliso Wetland Park, Kwazulu Natal, South Africa, Africa

Hippo (Hippopotamus amphibius), located in shallow water, Moremi Wildlife Reserve, Ngamiland, Botswana, Africa

Hippo (Hippopotamus amphibius), grazing in shallow water, Moremi Wildlife Reserve, Ngamiland, Botswana, Africa

Hippopotamus (Hippopotamus amphibius) under water looking into camera. Black and white wildlife image. Hwange National Park, Zimbabwe, Africa

Hippos (Hippopotamus amphibius) on shore, Lake Kariba, Zimbabwe, Africa

Hippopotamus (Hippopotamus amphibius) on meadow, Chobe National Park, Botswana, Africa