View of Hippopotamus (Hippopatamus amphibius), adult, in water, in Kruger National Park, South Africa, Africa

View of Hippopotamus (Hippopatamus amphibius), adult, in water, in Kruger National Park, South Africa, Africa

View of Hippopotamus (Hippopatamus amphibius), adult, in water, in Kruger National Park, South Africa, Africa

View of Hippopotamus (Hippopatamus amphibius), adult, in water, in Kruger National Park, South Africa, Africa

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

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

Hippopotamus (Hippopatamus amphibius), yawning or threatening adult, St. Lucia Wetland Park, South Africa, Africa

Hippopotamus (Hippopatamus amphibius), yawning or threatening adult, St. Lucia Wetland Park, South Africa, 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) on the sandy bank of a river, adult, Kruger National Park, South Africa, Africa

Hippos arguing (Hippopatamus amphibius) in the water, iSimangaliso Wetland Park, National Park, Kwazulu Natal, South Africa, Africa

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

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

Hippo, (Hippopotamus amphibious) challenging with wide open mouth in Kwando River. Bwabwata National Park, Namibia, Africa

Hippo, (Hippopotamus amphibious) challenging in Kwando River. Bwabwata National Park, Namibia, Africa

Hippopotamus (Hippopatamus amphibius), adult, in water, Sabi Sand Game Reserve, Kruger National Park, South Africa, Africa

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

Hippopotamus (Hippopatamus amphibius), adult, in water, standing, on bank, Kruger National Park, South Africa, Africa

Hippo, (Hippopotamus amphibious) is challenging, open mouth and teeth. Angry facial expression. Behind the hippo pod. Kwando River, Bwabwata National Park, Namibia, Africa

Hippos (Hippopotamus amphibius) yawning, the animal opens its mouth upward at the sky. Black and white image. Hwange National Park, Zimbabwe, Africa

Hippopotamus (Hippopatamus amphibius), adult, in water, Sabi Sand Game Reserve, Kruger National Park, South Africa, Africa

Hippopotamus (Hippopotamus amphibius) in Kruger National Park, South Africa, Africa

Hippos (Hippopotamus amphibius), South Luangwa, Zambia, Africa