The Eurasian brown bear has brown fur, which ranges from yellowish-brown to dark brown, red-brown, and almost black in some cases; albinism has also been recorded. The fur is dense to varying degrees and the hair can grow up to 10 cm in length. The head normally is quite round in shape and has relatively small rounded ears, a wide skull and a mouth equipped with 42 teeth, including predatory teeth. It has a powerful bone structure and large paws equipped with claws that can grow up to 10 cm in length. The weight varies depending on habitat and the time of the year. They have a lifespan of 20 to 30 years in the wild. The brown bear has long been extinct in Ireland, Britain, Denmark, the Netherlands and Belgium, but still exists in Northern Europe and in Russia.