The guard hairs of seals form a waterproof barrier due, in part, to their flattened shape.

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"Guard hairs may be flattened in shape; this adaptation is most marked among aquatic mammals such as seals, so it is evidently a waterproofing device." (Foy and Oxford Scientific Films 1982:83)

The grand design: Form and colour in animalsBLA Publishing Limited for J.M.Dent & Sons Ltd, Aldine House, LondonOctober 1, 1983
Sally Foy

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