Jan Mayen has no indigenous mammals, but the island is home to many birds. Both the novice and the experienced birder will be delighted at the birding opportunities during their Jan Mayen cruise. Ninety-eight bird species have been documented by the personnel living at the weather station, though only 22 species have a significant presence. Some of these include the fulmar (a relative of the albatross), the striking black-and-white polar guillemot, the tiny puffin, and the eider duck. Fulmars are most common, with an estimated 160,000 nesting couples, followed by the guillemot, with over 100,000 individuals.
Harper seals and many species of whale—including humpback and Minke—can be spotted during a trip to Jan Mayen. And occasionally even a polar bear will make its way to the island, though this happens less often as there is less ice now than there was a century ago. Polar bears have not been seen on the island since 1990.