Antlers are shed annually and are made of bone. The horn sheath of a Pronghorn is a little of both. It is made of keratin growing on a bony core AND it is shed annually. In addition, the horn sheath is branched in male pronghorns. True horns are always unbranched.
Pronghorns typically have twins.
They are born at the end of winter and weigh 5 - 7 pounds at birth. They can walk in less than an hour and can outrun a man when four days old. Still, they are very vulnerable to predators in their first month of life. Coyotes and golden eagles are their greatest enemies. In order to avoid detection by predators the fawns have almost no odor and will bed down and lie still most of the time.