Tony Heald / Hippopotamus {Hippopotamus amphibius} territorial defense at water edge, Chobe national park, Botswana.

Anup Shah / Hippos courting {Hippopotamus amphibius} Masai Mara NR, Kenya.

Ammonite / Group of sub-adult African lions (Panthera leo) chasing and jumping on a mother Hippopotamus (Hippopotamus amphibius) and her calf, footage taken at night using infrared camera technology, Masai Mara,...

Ammonite / Sub-adult African lioness (Panthera leo) chasing and jumping onto the back of a Hippopotamus (Hippopotamus amphibius), footage taken at night using infrared camera technology, Masai Mara, Kenya.

Jabruson / Hippopotamuses fighting (Hippopotamus amphibius) taken before major crash in numbers in the 1990s due to political instability and hunting. Rwindi sector of the Virunga National Park. Democratic Repub...

Denis-Huot,Denis-Huot / Hippopotamus (Hippopotamus amphibius) underwater, Mzima Springs, Tsavo West national park, Kenya. Vulnerable species.

Denis-Huot,Denis-Huot / Hippopotamus (Hippopotamus amphibius) males in a muddy pond, aerial view, Rwindi national park, Democratic Republic of Congo. Vulnerable species.

Roy Mangersnes / Hippopotamus (Hippopotamus amphibius) in a small lagoon, Okavango Delta, Botswana, November.

Nick Garbutt / Adult male Hippopotamus (Hippopotamus amphibius) posturing in agressive 'yawn' behaviour, Luangwa River, South Luangwa National Park, Zambia, November

Nick Garbutt / Adult male Hippopotamuses (Hippopotamus amphibius) posturing in aggressive 'yawn' behaviour, Luangwa River, South Luangwa National Park, Zambia, November. Digital composite (two frames stitched togeth...

Anup Shah / Hippopotamus head portrait (Hippopotamus amphibius) Masai Mara National Reserve, Kenya

Martin Dohrn / Thermal camera image of hippos (Hippopotamus amphibius), crocodile (Crocodylus niloticus) and wildebeest (Connochaetes taurinus, far left) on the banks of the Mara River, Masai Mara, Kenya. Image take...