Fauna include musk oxen, Arctic wolves, Arctic foxes, Arctic hares, and lemmings. Wildlife includes deer, wildcats, coyotes, hares, rabbits and ducks. They favoured their packs of dogs and hounds trained to chase foxes, hares and boars. Elk browsing improves forage for other herbivores like deer, voles and snowshoe hares. Stoats may prey on young hares. Siberian tigers also take smaller species like hares, rabbits, pikas and salmon as food. Single jackals hunt rodents, hares, and birds. There are numerous deer, roe deer, boar, and hares. It typically preys on antelopes, rodents, and hares. Some viral strains also affect hares and cottontail rabbits. Denmark is also home to smaller mammals, such as polecats, hares and hedgehogs. The tiger quoll's diet is dominated by mammals such as brushtail possums, rabbits and hares. Eight species of rabbits and hares occur in California. Smaller game includes whitefish, arctic char, arctic hares, and ptarmigan. Snowshoe hares browse paper birch seedlings, and grouse eat the buds.