Tui De Roy / Galapagos sea lion (Zalophus wollebaeki) female and male on red volcanic beach, Rabida Island, Galapagos, Ecuador
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Tui De Roy / Black rhino (Diceros bicornis) and White rhino (Ceratotherium simum), being harrassed by playfighting White rhino bull, Solio Game Reserve, Laikipia, Kenya. September.
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Tui De Roy / Black rhino (Diceros bicornis) and White Rhino (Ceratotherium simum) bulls facing off. Solio Game Reserve, Laikipia, Kenya. September.
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SCOTLAND: The Big Picture / Orca whales (Orcinus orca) pod surfacing together, Shetland, Scotland, UK. April.
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SCOTLAND: The Big Picture / Orca (Orcinus orca) surfacing and blowing, Shetland, Scotland, UK, August.
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Will Burrard-Lucas / Black and white image of African elephant (Loxodonta africana) bulls males facing off against each other, Tsavo Conservation Area, Kenya. Editorial use only. Other uses need clearance.
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Tui De Roy / Galapagos sea lion (Zalophus wollebaeki) killing tuna. A group of the sea lion bulls have learnt to herd Pelagic yellowfin tuna into a small cove, trapping them. The fish often leap ashore in an effor...
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Tui De Roy / Galapagos sea lion (Zalophus wollebaeki) hunting tuna. A group of the sea lion bulls have learnt to herd Pelagic yellowfin tuna into a small cove, trapping them. The fish often leap ashore in an effor...
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Tui De Roy / Galapagos sea lion (Zalophus wollebaeki) hunting tuna. A group of the sea lion bulls have learnt to herd Pelagic yellowfin tuna into a small cove, trapping them. The fish often leap ashore in an effor...
Neil Aldridge / Sable antelope (Hippotragus niger) bull charging through the shallows of the Selinda Spillway, with another behind, northern Botswana, August.
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Wim van den Heever / African elephant (Loxodonta africana) three big bull elephants spending the late afternoon at waterhole, Ol'Donyo Kenya.
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Danny Green / Moose Bull (Alces alces) walking in forest clearing, Denali National Park, USA, September
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Danny Green / Caribou / Reindeer bull (Rangifer tarandus) close-up grazing, Denali National Park, Alaska, USA, September
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George Sanker / Moose (Alces alces) bull swimming in water, Baxter State Park, Maine, USA.
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Wim van den Heever / African elephant (Loxodonta africana) bull 'One Ton' with massive tusks at dusk, with another behind. Chyulu Hills, Kenya.
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Wim van den Heever / Two Gemsbok bulls (Oryx gazella) males fighitng, Etosha National Park, Namibia.
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Jeff Vanuga / Shiras moose (Alces alces shirasi) bull in rut. Grand Teton National Park, Wyoming, USA, October.
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Wim van den Heever / African elephant (Loxodonta africana) two bulls, Chyulu Hills, Kenya.
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Wim van den Heever / African elephant (Loxodonta africana) bull dust-bathing, Chyulu Hills, Kenya.
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Richard Du Toit / Black wildebeest (Connochaetus gnou) bull silhouetted at dawn, Rietvlei Nature Reserve, Gauteng Province, South Africa.
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Pal Hermansen / European moose (Alces alces) bulls near houses, Nordland, Norway. July.
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George Sanker / Elk (Cervus elaphus canadensis) bull in velvet. Yellowstone National Park, Wyoming, USA. June.
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Enrique Lopez-Tapia / Woman with stick at the Jumping of the bulls Hamer ceremony. This Hamer ceremony, is a right of passage into manhood for Hamer boys. During the ceremony young female relatives of the boys beg to be wh...
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Enrique Lopez-Tapia / Hamer women in traditional clothing at the Jumping of the bulls ceremony. Ethiopia, November 2014
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Denis-Huot / African elephant (Loxodonta africana) standing in the rain, Masai-Mara Game Reserve, Kenya. March.
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Jean E. Roche / Group of bullfighters in European Bullfighting Championship 2012, Arenes d'Arles, Camargue, France, September 2012.
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Jean E. Roche / Man leaping over bull in European Bullfighting Championship 2012, Arenes d'Arles, Camargue, France, September 2012.
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Jean E. Roche / Herd of Camargue bulls, Camargue, France, May.
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Jean E. Roche / Bull run, with Camargue bulls leaping over hay bales, Camargue, France, July 2012.
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Wild Wonders of Europe / Widstrand / Ganado bravo, fighting bull portrait, Ciudad Rodrigo, Salamanca Region, Castilla y Leon, Spain
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Steven Kazlowski / Walrus (Odobenus rosmarus) two young bulls, in waters along Spitsbergen and the northwestern coast of the Svalbard Archipelago, Norway, Arctic Ocean, July
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Kristel Richard / During the Festa do Colete Encarnado (Red Waistcoat Festival), a bull running festival, a traditionally dressed 'cavalheiro' delivers the 'banderilla' mounted on his Lusitano stallion in the bullring...
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Ben Osborne / African elephants (Loxodonta africana) bulls crowd into an emptying waterhole to drink, Savuti, Botswana. Taken on location for BBC Planet Earth series, 2005
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Juan Carlos Munoz / Granite feeding troughs for bulls in Sierra de Andujar Natural Park, Jaen, Andalusia, Spain, Jan 2010
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Charlie Summers / African Elephant (Loxodonta africana) bulls in dominance fight, Mono Pools national Park, Zimbabwe, Southern Africa
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Patricio Robles Gil / Matador in final stages of bullfight leaps over bull to pierce bull between horns with blade, Plaza de Toros, Mexico City, Mexico
Sequence
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Inaki Relanzon / Boy riding a bull, Inle Lake, Shan State, Myanmar, Burma. August 2009
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Eric Baccega / Two Elk (Cervus canadensis) bulls at sunset, Jasper National Park, Rocky Mountains, Alberta, Canada, September
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Wild Wonders of Europe / Geslin / Grey seal (Halichoerus grypus) bulls fighting covered in mud, Donna Nook, Lincolnshire, UK, November 2008
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Tony Heald / African elephant {Loxodonta africana} bulls walking in line, Etosha national park, Namibia.
