North America does not have antelope. These antelope- looking animals I photographed here, are called pronghorns. Actual antelopes are only found in Africa.
Pronghorns are the fastest land mammal in the western hemisphere. "They can accelerate in seconds to a cruising speed of 40 or 45 miles per hour and keep it up flat-out for four miles or more, with bursts up to 55 or 60 mph in linked strides reaching nearly 30 feet each." (source)
According to the National Geographic, pronghorns evolved to outrun a now extinct cheetah-like predator.
At their peak population, there were upwards of 20 million pronghorns. As settlers expanded westward, the population fell steadily toward extinction until about 1910. The population gained in numbers, and by the 1980's there were an estimated one million.
In Colorado, the population was at a low of 5,000 in the 1940's and has grown to a high of 85,000 statewide mostly coming from Utah and Wyoming. Aside from humans, coyotes and golden eagles are their largest predators.
If you notice their white-haired rump hairs flared up, it means they are warning others of danger.
In the following years, wildlife managers began transplanting the antelope to other parts of Colorado." ~ From article written by Jennifer Brown of The Colorado Sun —
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The most recent antelope trap and relocation took place in 2010, when wildlife managers brought animals from southeastern Colorado to the Gunnison Basin because a particularly harsh winter in 2006-2007 had killed off many antelope there. Some of the animals were transplanted near Grand Junction to bulk up the population in Mesa County." - https://coloradosun.com/2019/01/21/colorado-pronghorn-antelope-recovery/