Giraffe and okapi
Although pronghorns are sometimes called antelopes they belong to a different family. Antelopes are a non-specific grouping in the family Bovidae, pronghorns are in the family Antilocapridae. The pronghorn is estimated to be the fastest land mammal in the Western hemisphere, or the second fastest (second to the cheetah) depending on how the speed is described; it can run 35 mph for 4 mi (56 km/h for 6 km), 42 mph for 1 mi (67 km/h for 1.6 km), and 55 mph for 0.5 mi (88.5 km/h for 0.8 km).