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It takes about eight years for the trademark circular horns of a Dall's ram to grow to full size. These horns are made of keratin, the same substance as fingernails. Although their thickened skulls are an adaptation to the tremendous impact of their head-butting, it is not uncommon for rams to have bloodied faces and splintered, or broomed, horn tips. Dall's sheep travel to sites called "licks" to eat the mineral-rich dirt, which balances their diet. 
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