Fun Fact: What is the difference between horns and antlers? Antlers are an extension of the animal’s skull. They are made of bone and usually only the males have them (Reindeer are an exception to that rule.) Horns on the other hand (or head!) are made of two parts — a bony core, surrounded by a tough keratinous covering, like your nails, grown from modified hair follicles.
Antlers are shed yearly, but horns usually are not. Pronghorn males are the exception here and shed their horn covers every year. Pronghorn female also have horns but they are smaller and not shed. Another difference between the Pronghorn and true antelopes is that the latter have curved single pointed horns which grow continuously and are not shed. This is probably more than you ever wanted to know about bony protuberances!