Roy Mangersnes / Hippopotamus (Hippopotamus amphibius) in a small lagoon, Okavango Delta, Botswana, November.
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Richard Du Toit / Hippopotamus (Hippopotamus amphibius) male with Red-billed Oxpecker (Buphagus erythrorhynchus) pair on back, Chobe National Park, Botswana
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Ingo Arndt / African Jacana (Actophilornis africana) foraging near Hippopotamus (Hippopotamus amphibius) amid water lettuce, Masai Mara National Reserve, Kenya
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ZSSD / East African River Hippopotamus (Hippopotamus amphibius kiboko) with open mouth in threat posture, native to Africa
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Richard Du Toit / Hippopotamus (Hippopotamus amphibius) threat yawning, Khwai River Botswana
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Mitsuaki Iwago / Hippopotamus (Hippopotamus amphibius) with Yellow-billed Oxpecker (Buphagus africanus), Serengeti National Park, Tanzania
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Tim Fitzharris / Hippopotamus (Hippopotamus amphibius) at water surface, Tanzania
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Gerry Ellis / Hippopotamus (Hippopotamus amphibius) swimming in water lettuce, with Cattle Egret (Bulbulcus ibis) perched on head, Serengeti National Park, Tanzania
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Tim Fitzharris / Hippopotamus (Hippopotamus amphibius) with mouth agape, Kenya
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Shin Yoshino / African Elephant (Loxodonta africana) along waterhole with wallowing Hippopotamuses (Hippopotamus amphibious) and Cattle Egret (Bubulcus ibis) flock, Ngorongoro Crater, Tanzania
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Mitsuaki Iwago / Hippopotamus (Hippopotamus amphibius) emerging from a river full of water lettuce, Botswana
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Konrad Wothe / Hippopotamus (Hippopotamus amphibius) grazing, Africa
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Mitsuaki Iwago / Hippopotamus (Hippopotamus amphibius) mother wallowing with her young, Kenya
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ZSSD / East African River Hippopotamus (Hippopotamus amphibius kiboko) mother and baby playing in water, native to Africa
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ZSSD / East African River Hippopotamus (Hippopotamus amphibius kiboko) mother and baby underwater, native to Africa
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ZSSD / Hippopotamus (Hippopotamus amphibius) swimming submerged in tank, native to Africa
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ZSSD / Hippopotamus (Hippopotamus amphibius) mother and baby interacting underwater in tank, native to Africa
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ZSSD / East African River Hippopotamus (Hippopotamus amphibius kiboko) mother and baby underwater, native to Africa
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Winfried Wisniewski / Hippopotamus (Hippopotamus amphibius) in water lettuce, Masai Mara, Kenya
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Tony Heald / Hippopotamus (Hippopotamus Amphibius) head portrait at surface, Mana Pools National Park, Zimbabwe October 2012
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Tony Heald / Hippopotamus (Hippopotamus amphibius) ears flicking water when opening after surfacing, Mana Pools National Park, Zimbabwe, October 2012
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Tony Heald / RF- Hippopotamus (Hippopotamus amphibius) coming to end of a yawn whilst in river. Mana Pools National Park, Zimbabwe. October 2012. (This image may be licensed either as rights managed or royalty fre...
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Tony Heald / Hippopotamus (Hippopotamus amphibius) yawning whilst in river, Mana Pools National Park, Zimbabwe October 2012
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Richard Du Toit / Hippopotamus (Hippopotamus amphibius) displaying, Kruger National Park, South Africa
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Richard Du Toit / Hippopotamus (Hippopotamus amphibius), Kruger National Park, South Africa
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Richard Du Toit / Grey Heron (Ardea cinerea) landing on Hippopotamus (Hippopotamus amphibius), Kruger National Park, South Africa
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Richard Du Toit / Hippopotamus (Hippopotamus amphibius) sticking out tongue, Kruger National Park, South Africa
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Richard Du Toit / Hippopotamus (Hippopotamus amphibius) group sleeping on riverbank, Kruger National Park, South Africa
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Oriol Alamany / Hippopotamus (Hippopotamus amphibius) in Sabie River at dusk, Kruger National Park, Transvaal, South Africa, September.
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Ann & Steve Toon / Hippopotamus (Hippopotamus amphibius) yawning, Kruger National Park, Mpumalanga, South Africa
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Ann & Steve Toon / Hippopotamus (Hippopotamus amphibius) with calf, Kruger National Park, Mpumalanga, South Africa
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Anup Shah / Hippopotamus (Hippopotamus amphibius) juvenile with pink skin from rare disease Leucism with resting group, Masai Mara National Reserve, Kenya, September
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Anup Shah / Hippopotamus (Hippopotamus amphibius) resting out of water, Masai Mara National Reserve, Kenya, August
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Anup Shah / Hippopotamus (Hippopotamus amphibius) juvenile with pink skin from rare disease Leucism with resting group, Masai Mara National Reserve, Kenya, September
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Kerstin Hinze / Hippopotamus (Hippopotamus amphibius) splashing through water. St Lucia, KwaZulu-Natal, South Africa, October.
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Tony Heald / Hippopotamus (Hippopotamus amphibius) head at water surface at sunset, Chobe National Park, Botswana
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Richard Du Toit / Hippopotamus (Hippopotamus amphibius) grazing, Limpopo, South Africa
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Richard Du Toit / Hippopotamus (Hippopotamus amphibius) bulls fighting, Kruger National Park, South Africa
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Richard Du Toit / Hippopotamus (Hippopotamus amphibius) resting on shore, Kruger National Park, South Africa
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Richard Du Toit / African Elephant (Loxodonta africana) bull chasing Hippopotamus (Hippopotamus amphibius) group, Kruger National Park, South Africa
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Richard Du Toit / Hippopotamus (Hippopotamus amphibius) nostrils, Kruger National Park, South Africa
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ZSSD / East African River Hippopotamus (Hippopotamus amphibius kiboko) playing with calf, native to Africa
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ZSSD / East African River Hippopotamus (Hippopotamus amphibius kiboko) mother with swimming calf, native to Africa
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Theo Allofs / Hippopotamus (Hippopotamus amphibius) territorial display, Moremi Game Reserve, Okavango Delta, Botswana. Sequence 1 of 3
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Theo Allofs / Hippopotamus (Hippopotamus amphibius) territorial display, Moremi Game Reserve, Okavango Delta, Botswana. Sequence 3 of 3
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Theo Allofs / Hippopotamus (Hippopotamus amphibius) territorial display, Moremi Game Reserve, Okavango Delta, Botswana. Sequence 2 of 3
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Theo Allofs / Hippopotamus (Hippopotamus amphibius) running in water, Moremi Game Reserve, Okavango Delta, Botswana
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Theo Allofs / Hippopotamus (Hippopotamus amphibius) mock charging, Moremi Game Reserve, Okavango Delta, Botswana
Vincent Grafhorst / Hippopotamus (Hippopotamus amphibius), Moremi Game Reserve, Khwai River, Botswana
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Shin Yoshino / Hippopotamus (Hippopotamus amphibius) pair fighting in water, Masai Mara, Kenya
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Suzi Eszterhas / Hippopotamus (Hippopotamus amphibius) displaying, Serengeti National Park, Tanzania
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Suzi Eszterhas / Hippopotamus (Hippopotamus amphibius) pair fighting, Serengeti National Park, Tanzania
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Suzi Eszterhas / Hippopotamus (Hippopotamus amphibius), Serengeti National Park, Tanzania
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Richard Du Toit / Hippopotamus (Hippopotamus amphibius) trio foraging on shore, Chobe National Park, Botswana
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Richard Du Toit / Hippopotamus (Hippopotamus amphibius) entering water with two Red-billed Oxpeckers (Buphagus erythrorhynchus), Moremi Game Reserve, Botswana
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Richard Du Toit / Hippopotamus (Hippopotamus amphibius) group sleeping on riverbank, Moremi Game Reserve, Botswana
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Richard Du Toit / Hippopotamus (Hippopotamus amphibius) mother and calf, Khwai River, Botswana
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Vincent Grafhorst / Hippopotamus (Hippopotamus amphibius) male displaying, Moremi Game Reserve, Okavango Delta, Botswana
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Vincent Grafhorst / Hippopotamus (Hippopotamus amphibius) tail, Moremi Game Reserve, Okavango Delta, Botswana
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Vincent Grafhorst / Hippopotamus (Hippopotamus amphibius) male in the water, Moremi Game Reserve, Okavango Delta, Botswana
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Vincent Grafhorst / Hippopotamus (Hippopotamus amphibius) male in the water, Moremi Game Reserve, Okavango Delta, Botswana
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Vincent Grafhorst / Hippopotamus (Hippopotamus amphibius) trio in the water, Moremi Game Reserve, Okavango Delta, Botswana
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Richard Du Toit / Hippopotamus (Hippopotamus amphibius) male threat displaying, Khwai River, Botswana
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Kevin Schafer / Hippopotamus (Hippopotamus amphibius) amid water lettuce, Masai Mara, Kenya
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Ingo Arndt / Hippopotamus (Hippopotamus amphibius) charging through water, Masai Mara National Reserve, Kenya
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Ingo Arndt / Hippopotamus (Hippopotamus amphibius), Masai Mara National Reserve, Kenya
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Ingo Arndt / Hippopotamus (Hippopotamus amphibius) threat displaying, Masai Mara National Reserve, Kenya
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Suzi Eszterhas / Hippopotamus (Hippopotamus amphibius) mother with 2 to 3 week old calf, Masai Mara, Kenya
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Richard Du Toit / Hippopotamus (Hippopotamus amphibius) on land, Kruger National Parl, South Africa
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Gerry Ellis / Hippopotamus (Hippopotamus amphibius) mother and young in water lettuce are surrounded by Cattle Egrets (Bulbulcus ibis), Serengeti National Park, Tanzania