Scarcely vegetated slopes at the Olrik fjord are the breeding habitat of red knots. -Some parts of Northern Greenland are not covered by the huge inland ice cap. They contain the most northerly ice-free region of the world. Precipitation levels are so low (only about 25 to 200 mm per year, all as snow) that it is called a polar desert. It was not covered by glaciers during the most recent ice age. The Arctic desert is home to a number of highly adapted species, which can cope with the extreme conditions or, as some long-distant migratory bird species come there only for a short summer season