Polar bears are the largest species of bear in the world, and live mostly in areas that have sea ice during a significant part of the year. A 2004 survey of the Barents Sea population concluded that there are about 3,000 polar bears in this region.
Svalbard has an abundant birdlife and wildlife. Species have adapted to the Svalbard climate over evolutionary time scales, but some species still migrate to temperate regions in winter. The most extreme is the Arctic tern, which migrates between Svalbard and Antarctica.