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An 'albino'[a] redwood is a redwood tree which is unable to produce chlorophyll, and so has white needles instead of the normal green. In order to survive it must join its roots to the roots of a normal redwood, usually the parent tree from whose base it has sprouted, from which it obtains nutrition as a parasite. Only about sixty examples are known. These can be found in both Henry Cowell Redwoods State Park and Humboldt Redwoods State Park, with eight trees in the first. However, the exact locations are not publicized to protect the rare trees. They reach a maximum height of about 20 m (66 ft).