Horn sheath growth in Pronghorns
Pronghorns' unique horns shed the sheath yearly, making their horn sheath growth an interesting subject as they are the only ungulate with this characteristic.
An odd Pronghorn with two extra horns?
This image shows a side view of the Pronghorn buck's face with the two unusual horn growths shown protruding from its muzzle.
The Horns of Pronghorns
The horns of Pronghorns are composed of a permanent slender, laterally flattened blade of bone that is covered by a keratinous sheath.