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Bighorn sheep have double-layered skulls shored with struts of bone for protection during their fierce head-butting. They also have a broad, massive tendon linking the skull and spine to help the head pivot and recoil from blows. 
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Bighorn sheep have double-layered skulls shored with struts of bone for protection during their fierce head-butting. They also have a broad, massive tendon linking the skull and spine to help the head pivot and recoil from blows.
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