Alex Hyde / Southern Elephant Seal bull (Mirounga leonina) close up portrait, King Haakon Bay, South Georgia. November.

Ann & Steve Toon / Leopard / mountain tortoise (Stigmochelys pardalis) with elephant bull (Loxodonta africana) behind in water, Addo elephant national park, Eastern Cape, South Africa, September

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.

Will Burrard-Lucas / Black and white image of African elephant (Loxodonta africana) bull with extremely long tusks, Tsavo Conservation Area, Kenya. Editorial use only.

Sebastian Kennerknecht / African Elephant (Loxodonta africana) bulls fighting, Kruger National Park, South Africa

Francois Savigny / Old African elephant bull in 'must', period of sexual dominance when he wil mate with females in his home range, Etosha National Park, S. Africa

Wim van den Heever / African elephant (Loxodonta africana) three big bull elephants spending the late afternoon at waterhole, Ol'Donyo Kenya.

Wim van den Heever / African elephant (Loxodonta africana) bull 'One Ton' with massive tusks at dusk, with another behind. Chyulu Hills, Kenya.

Wim van den Heever / African elephant (Loxodonta africana) bull dust-bathing, Chyulu Hills, Kenya.

Wim van den Heever / African elephant (Loxodonta africana) two bulls, Chyulu Hills, Kenya.

Sean Crane / Northern Elephant Seal (Mirounga angustirostris) male calling in territoral display with breath visible, San Simeon, California

Richard Du Toit / African Elephant (Loxodonta africana) bulls drinking, Shingwedzi River, Kruger National Park, South Africa