The coat of reindeer repels water via long guard hairs.

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“Naturally, animals that live in polar regions have the warmest coats of all. The reindeer’s coat combines long, water-repelling guard hairs with an extremely dense underfur, deep-piled like a shag carpet.” (Foy and Oxford Scientific Films 1982:84)

The grand design: Form and colour in animalsOctober 1, 1983
Sally Foy

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