Stock Photo - Pronghorn (Antilocapra americana) Adult Male. Each 'horn' is composed of slender, laterally flattened blade of bone growing from frontal bones of the skull into a permanent core covered by a sheath of skin shed each year. Custer State Park, South Dakota, United States of America.

Stock Photo: Pronghorn (Antilocapra americana) Adult Male. Each 'horn' is composed of slender, laterally flattened blade of bone growing from frontal bones of the skull into.

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