The cold lands north of the Arctic Circle-surrounding the Arctic Ocean and stretching across northern North America, adjacent to the ice cap in Greenland, and northern Scandinavia and Asia-are called tundra. A tundra habitat is dry and cold, and the air cannot hold much moisture. The Sun is only seen six months of the year. Many of the plants are dwarves, and because the area is snowbound for most of the year, no trees grow on the tundra. Few animals, mostly birds and smaller animals, live in the frigid temperatures year round.