If you were asked to think of a large mammal of the American prairie you might well say the bison, coyote or wolf, a measure of how much these species have settled in to our general consciousness. Yet there is one unique American animal which is less known but is perhaps the most charismatic of the Great Plains. Many refer to it as an antelope but that is far from the truth. A true American native, the Pronghorn has sojourned across the deserts and plains of North America for at least a million years: but an antelope it is not. Its closest relative is the giraffe.
The pronghorn is found nowhere else in the world except the interior western and central north of America. At first sight it certainly does resemble the antelope of the Old World but it is thought to be a classic example of convergent evolution. This is where species develop to inhabit at least two separate places in the world but which share features and behaviors which mean they may resemble each other despite no shared ancestry. To the untrained eye, their appearance would suggest that they are related species even when they are not.
