In some mammals both the awn and the undercoat are well developed, while in others the awn or undercoat predominates. What are the differences in the body coat of mammals?
The ratio of different types of hair in the coat of mammals is different, depending on the habitat and lifestyle of the animal. For example, the coat of a reindeer in winter has a well-developed undercoat and spinous hair. The undercoat enhances the insulating properties of the hairline, while the spinous hair protects the undercoat from damage. The summer fur of wild boars consists of only spinous hairs. Fur (mole) fur is formed only by downy hair. Bristles (wild boars) and needles (echidna, hedgehogs, porcupines) are modified guard hairs that perform a protective function.
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