More than a third of the park is covered by permanent snow and glacial ice. The Tasman, Godley, and Murchison are the principal rivers, being the outfall of park glaciers of the same names. Trees include beech, tussock, ribbonwood, alpine scrub, tree daisies, and celery pine. There are kea (alpine parrot), rock wren, bush hawk, pipit, pigeon, fantail, warbler, and a number of other varieties of birdlife. The park's animal life includes tahr (a type of wild goat), chamois, red deer, and feral cat. Mountain climbing, skiing, hunting, and walking provide recreation to visitors. Mount Cook National Park is part of the Te Wahipounamu (South West New Zealand) area, which was designated a UNESCO World Heritage site in 1990.