Two aggressive wild boars (Sus scrofa) in the snow in winter fighting vigorously by slashing each other with their tusks, Bavarian Forest National Park, GermanyYoung dogs (Canis lupus familiaris) playing in gardenGreylag goose / graylag goose (Anser anser) chasing competitor away from lake, GermanyArctic fox (Vulpes lagopus / Alopex lagopus) cubs play fighting at den on the tundra in summer, Lapland, SwedenTwo Red foxes (Vulpes vulpes) fighting in the snow in winter, ItalyEuropean Brown Hares (Lepus europaeus) boxing / fighting in field during the mating season, GermanyEuropean brown bears (Ursus arctos) fighting in pondBlack grouse (Lyrurus tetrix / Tetrao tetrix) two cocks fighting at lek, Dalarna, SwedenChinstrap penguin (Pygoscelis antarcticus) and Gentoo Penguin (Pygoscelis papua) fighting in the snow, Yankee Harbour, South Shetland Islands, Antarctica