How do kiwis survive in winter?

Kiwi have a thick layer of shaggy feathers. This layer is around 2.5 cm thick, helping to insulate the bird in cold weather. Most species of kiwi do not live in areas where snow falls regularly in winter. The Haast's Toloeka, which can inhabit elevations above the treeline, are able to burrow through the snow to reach their burrows in the winter.