Subarctic islands such as Isla de Hornos are known for their special climates. Like arctic tundra, they are extremely isolated, which makes for a reduced number of species, and their climates are extreme, so they can support just a few types of plants and animals. The tundra is mostly treeless, as the climate supports only grasses, shrubs, moss and lichen. While land mammals are rare on the tundra, marine mammals such as the southern elephant seal abound on the shore. And, of course, the tundra is an extraordinary breeding ground for albatrosses and a great number of other seabirds.