Anup Shah / Lioness (Panthera leo) trying to protect cubs from charging Cape buffalo herd (Syncerus caffer caffer), Masai Mara National Reserve, Kenya

Kristel Richard / Traditionally dressed Berber warriors, mounted on Barb and Arab Barb horses, galloping into battle firing their guns down during the Fantasia in Dar Es Salam, Morocco, June 2010

Mark Carwardine / Humpback whale (Megaptera novaeangliae) slapping the surface during courtship battle, Sea of Cortez, Baja California, Mexico

Markus Varesvuo / Black Grouse (Lyrurus tetrix) two males fighting, in territorial battle, Kuusamo Finland April

Loic Poidevin / African lion (Panthera leo) old male with battle wounds, Sergenti National Park, Tanzania, East Africa

Anup Shah / Lioness (Panthera leo) trying to warn off herd of Cape buffalo (Syncerus caffer caffer), Masai Mara National Reserve, Kenya

Steve Gettle / Mandarin Duck (Aix galericulata) male, Battle Creek, Michigan

Diane McAllister / Two wild stallions (Equus caballus) battle over a mare. Palomino Valley, Nevada, USA, April.

Diane McAllister / Wild stallion horse (Equus caballus) lying down to rest after a battle with another stallion over a mare. Palomino Valley, Nevada, USA, April.

Charlie Summers / Wild Horse (Equus caballus) stallions battle in dominance behaviour. Montana, USA, June.

Jenny E. Ross / Adult male Northern elephant seal (Mirounga angustirostris) swimming near shore, and vocalizing to other males on the beach, after losing a territorial battle. Ano Nuevo State Reserve, California, USA...

Jenny E. Ross / Adult male Northern elephant seal (Mirounga angustirostris) swimming near shore, and vocalizing to other males on the beach, after losing a territorial battle. Ano Nuevo State Reserve, California, USA...

Tim Laman / Human skulls and other bones on the floor of a cave in Triton Bay. Note skull with a large hole in it from possible battle wound. Raja Ampat, West Papua, Indonesia, April 2007

Kristel Richard / Traditionally dressed Berber warriors, mounted on Barb and Arab Barb horses, galloping into battle with guns pointed down during the Fantasia in Dar Es Salam, Morocco, June 2010

Mark Carwardine / Humpback whale (Megaptera novaeangliae) at surface showing bloodied tubercles on head during courtship battle, Sea of Cortez, Baja California, Mexico

Philippe Clement / The Lion Hill, the main memorial monument of the Battle of Waterloo, Eigenbrakel, Belgium

Philippe Clement / Commemorative stone and plaque near battlefield of the Battle of Waterloo, Eigenbrakel, Belgium, with Lion Hill memorial in the background.

Philippe Clement / The Lion Hill, the main memorial monument of the Battle of Waterloo, Eigenbrakel, Belgium

Mark Moffett / Argentine Ant (Linepithema humile) dead bodies piling up along the battle lines between two colonies, Escondido, California

Mark Moffett / Carpenter Ant (Camponotus sp) with dead army ants clinging to every limb after battle, Nigeria

Pete Oxford / Shrunken head (Tsantza), Shuar tribe, Ecuador. Jivaro Shuar tribe used to shrink head of enemies killed in battle - first they removed the skull and boiled it to shrink the head. Then the eyes and li...

Tim Fitzharris / Quaking Aspen (Populus tremuloides) forest in autumn colors on Battle Mountain, Colorado

GEORGETTE DOUWMA / Giant cuttlefish (Sepia apama), large battle scarred male preventing an intruding male from approaching an egg-laying female, who has now been joined by a third male. Spencer Gulf, Wayalla, South Aust...

Pete Oxford / Tsansa shrunken head, Shuar, Indian Ecuador. South America Jivaro Shuar tribe used to shrink head of enemies killed in battle - first they removed the skull and boiled it to shrink the head. Then th...

Pete Oxford / Tsansa shrunken head, Shuar, Indian Ecuador. South America Jivaro Shuar tribe used to shrink head of enemies killed in battle - first they removed the skull and boiled it to shrink the head. Then th...

Pete Oxford / Tsansa shrunken head, Shuar, Indian Ecuador. South America Jivaro Shuar tribe used to shrink head of enemies killed in battle - first they removed the skull and boiled it to shrink the head. Then th...

Gerry Ellis / Black Rhinoceros (Diceros bicornis) males on savannah ready to battle, Masai Mara National Reserve, Kenya

Michael Quinton / Common Raven (Corvus corax) pair in aerial battle for territorial rights, Yellowstone National Park, Wyoming

Michael Quinton / Common Raven (Corvus corax) group in aerial battle for territorial rights, Yellowstone National Park, Wyoming

Michael Quinton / Common Raven (Corvus corax) group flying, aerial battle for territorial rights, Yellowstone National Park, Wyoming

Mark Moffett / Goat Fly (Phytalmia mouldsi) professor Gary Dodson adds extensions onto a male's antlers to see if this increases his success in battle, Ball State University, Indiana

Mark Moffett / Stag Fly (Phytalmia cervicornis) two males from adjacent territories approach for battle, Papua New Guinea

Michael Quinton / Common Raven (Corvus corax) pair in aerial battle for territorial rights, Yellowstone National Park, Wyoming

Michael Quinton / Common Raven (Corvus corax) pair in aerial battle for territorial rights, Yellowstone National Park, Wyoming

Tui De Roy / Galapagos Sea Lion (Zalophus wollebaeki) territorial bull resting in bloody tide pool after victorious battle, Fernandina Island, Galapagos Islands, Ecuador

Nick Upton / Aggregating anemones showing battle lines between two warring colonies {Anthopleura elegantissima} California, USA

Paul D Stewart / Illustration of War Elephant (Elephas maximus), 1552, The Cosmographia, Book V, by Sebastian Munster (the early latin edition from the Basel printing house of Sebastian Heinrich Petri). Woodcut plate...

Paul D Stewart / Woodcut illustration of Bird of Paradise (Paradisaea). From Gesner's 'Icones Animalium', published by Christof Froschover, Zurich (1560). When Magellan returned as the first to sail around the world i...

Rick Tomlinson / Illbruck Challenge and News Corp battle towards Hobart on leg 3 of the Volvo Ocean Race, 2001-2002.

Rick Tomlinson / Amer Sport Too battle towards Hobart on leg 3 of the Volvo Ocean Race, 2001-2002.

Rick Tomlinson / Fifty footers "Matador" and "Sovereigh" battle it out for the leeward mark.

Rick Tomlinson / "News Corp" and "Illbruck Challenge" battle towards Hobart on leg 3 of the Volvo Ocean Race, 2001-2002.

Rick Tomlinson / Fifty footers battle it out downwind.

Steve Gettle / Mute Swan (Cygnus olor), Battle Creek, Michigan

Jim Brandenburg / Canada Jay (Perisoreus canadensis) perching on the antlers of two Moose (Alces alces andersoni) who locked antlers in battle and died together, Michigan

Mark Moffett / Leafcutter Ant (Atta cephalotes) worker returns from battle carrying the corpse of a nest-mate, in this case a soldier much larger than herself, Belize

Flip Nicklin / Humpback Whale (Megaptera novaeangliae) dorsal fin bloodied from battle over female, Maui, Hawaii - notice must accompany publication; photo obtained under NMFS permit 987

Jabruson / Uganda kob. Male tests female urine. {Kobus kob thomasi} Virunga NP Zaire congo.

LYNN M. STONE / Grey wolves in snow {Canis lupus} Captive

Asgeir Helgestad / Norwegian fjord horses pulling carts cross bridge over river waterfall on way to Briksdal glacier, Jostedalsbreen NP, Sogn og Fjordane, Norway

Asgeir Helgestad / Mountain stream flowing from Briksdal glacier, Jostedalsbreen NP, Sogn og Fjordane, Norway

Asgeir Helgestad / Tourists travel in horse drawn carriage to Briksdal glacier, Olden, Jostedalsbreen NP, Sogn og Fjordane, Norway

Asgeir Helgestad / Climbers on Briksdal glacier, Jostedalsbreen NP, Olden, Sogn og Fjordane, Norway

Asgeir Helgestad / Climbers on Briksdal glacier, Jostedalsbreen NP, Olden, Sogn og Fjordane, Norway

Asgeir Helgestad / Climbers on Briksdal glacier, Jostedalsbreen NP, Olden, Sogn og Fjordane, Norway

Asgeir Helgestad / Blue ice in Briksdals glacier, Jostedalsbreen NP, Olden, Sogn og Fjordane, Norway

Asgeir Helgestad / Brenndals glacier flowing into river, Jostedalsbreen NP, Olden, Sogn og Fjordane, Norway

Asgeir Helgestad / Brenndals glacier flowing into river, Jostedalsbreen NP, Olden, Sogn og Fjordane, Norway

Asgeir Helgestad / Brenndals glacier flowing into river, Jostedalsbreen NP, Olden, Sogn og Fjordane, Norway

Asgeir Helgestad / Common Foxglove {Digitalis purpurea} Jostedalsbreen NP, Sogn og Fjordane, Norway

Asgeir Helgestad / Rosebay willowherb flowering {Epilobium angustifolium} with Briksdal glacier in background, Jostedalsbreen NP, Sogn og Fjordane, Norway

Asgeir Helgestad / Rosebay willowherb flowering {Epilobium angustifolium} with Briksdal glacier in background, Jostedalsbreen NP, Sogn og Fjordane, Norway

Asgeir Helgestad / Rosebay willowherb {Epilobium angustifolium} with Briksdal glacier in background, Jostedalsbreen NP, Sogn og Fjordane, Norway

Asgeir Helgestad / Tourists travel in horse drawn carriage to Briksdal glacier, Olden, Jostedalsbreen NP, Sogn og Fjordane, Norway