Mountain gazelles are one of the few mammals, where the male and female have horns. Males have bigger horns with rings around them. Females also have horns, but they are thinner and shorter. Mountain gazelles are sexually dimorphic, which means that males are larger than females. Male can weigh from 17-29.5 kg. Females can weigh 16–25 kg. Mountain gazelles can run up to 80 km/h (50 mph).