I grew up knowing all the wildlife of the Midwest but not really knowing much about them or how unique they are. The pronghorn, an especially unique North American species, is the second fastest land mammal on Earth, reaching speeds of 60 mph. It can also maintain high speeds for miles, much further than the cheetah. But what really set pronghorn appart are their horns. Pronghorns, as their name suggests, are the only species with multi-pronged horns. They are also the only species on Earth that sheds its horns each year. However, do not be mistaken. They are not antlers.