Sumo competition at the Kokugikan stadium in Tokyo, Japan, Asia

Sumo wrestling competition at the Kokugikan stadium, Tokyo, Japan, Asia

Two sumo wrestlers pushing hard to put their opponent out of the circle, sumo wrestling competition, Tokyo, Japan, Asia

Sumo wrestling competition at the Kokugikan stadium, Tokyo, Japan, Asia

Some sumo fighters throwing salt before a fight at the Kokugikan stadium, Tokyo, Japan, Asia

Two sumo wrestlers pushing hard to put their opponent out of the circle, sumo wrestling competition, Tokyo, Japan, Asia

Sumo wrestling competition at the Kokugikan stadium, Tokyo, Japan, Asia

Two sumo wrestlers fighting at the Kokugikan stadium, Tokyo, Japan, Asia

Two male impala (Aepyceros melampus) sparring, Kruger National Park, South Africa, Africa

Teenagers playing cards in Ping An, Guilin, China

Polo match in Hampshire, England, United Kingdom

Golden Eagle (Aquila chrysaetos) fighting with a red fox (Vulpes vulpes) over a carcass, Sinite Kamani Nature Park, Bulgaria, Europe

Common Toads (Bufo bufo), two males fighting over a female, Thuringia, Germany, Europe

Sailing boats competing in a regatta on Schilksee, Kiel Week 2008, Kiel, Schleswig-Holstein, Germany, Europe

Protest of opponents of the Waldschloesschenbruecke which painted the Logo of the Unesco on old trees. Dresden, Saxony, Germany

High-rise buildings, BahnTower and Kollhoff-Tower from a worm's-eye view, Potsdamer Platz, Berlin, Germany, Europe

White-tailed Eagle or Sea eagle (Haliaeetus albicilla) in flight with prey, and Great Black-backed Gull (Larus marinus) behind, Flatanger, Nordtrondelag, Norway, Scandinavia, Europe

White-tailed Eagle or Sea eagle (Haliaeetus albicilla) in flight with prey, badgered by a Great Black-backed Gull (Larus marinus) behind, Flatanger, Nordtrondelag, Norway, Scandinavia, Europe

Fighting Gemsboks (Oryx gazella) and ostriches (Struthio camelus), Kgalagadi Transfrontier Park, North Cape, South Africa, Africa

Fighting Gemsboks (Oryx gazella), Kgalagadi Transfrontier Park, North Cape, South Africa, Africa

Fighting Gemsboks (Oryx gazella), Kgalagadi Transfrontier Park, North Cape, South Africa, Africa

Alpine ibex (Capra ibex), also steinbock or Ibex, fighting for rank, High Tauern National Park, Carinthia, Austria, Europe

Alpine ibex (Capra ibex), also steinbock or Ibex, fighting for rank, High Tauern National Park, Carinthia, Austria, Europe

Red Deer (Cervus elaphus), fighting stags, Copenhagen, Denmark, Europe

Alpine ibex (Capra ibex), also steinbock or Ibex, fighting for rank, High Tauern National Park, Carinthia, Austria, Europe

Punk taking a photograph at a NPD rally in Ulm, Baden-Wuerttemberg, Germany, Europe

White-tailed Eagle or Sea eagle (Haliaeetus albicilla) and Common Gull or Mew Gull (Larus canus) hunting together, Flatanger, Nordtrondelag, Norway, Scandinavia, Europe

Two tigers (Panthera tigris) fighting in water

Women swimming laps in pool

Women swimming laps in pool

Hofsos at Skagafjoerdur during winter, Iceland. Hofsos, a traditional fishing village with many historic buildings on the coast of Skagafjoerdur during winter. The municipal swimming pool. europe, northern europe, iceland, March

Hofsos at Skagafjoerdur during winter, Iceland. Hofsos, a traditional fishing village with many historic buildings on the coast of Skagafjoerdur during winter. The municipal swimming pool. europe, northern europe, iceland, March