Why have only one pair of horns when you could have two?12,000 years ago these ancient double-horn
Why have only one pair of horns when you could have two?12,000 years ago these ancient double-horned mammals roamed North America. Stockoceros were part of the antilocaprid family, to which pronghorns belong - more related to giraffes than antelopes. : @smithsoniannmnh -- source link