Both males and females have horns, and the horns continue growing throughout their lives. In males, they develop a thick horn boss across the forehead, which they use for spectacular head-to-head clashes during the breeding season.

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Muskox

Musk oxen have two layers of fur, including an incredibly warm undercoat called qiviut, one of the finest and warmest natural fibers in the world.

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Musk oxen are ancient animals that lived alongside woolly mammoths. They disappeared from much of Europe and Scandinavia, but were reintroduced to Norway in the 20th century.