The Grand Teton pronghorn are notable for the invariance of their migration path and the severity of its constriction at three critical spots, known as Trappers Point, the Red Hills, and the Funnel.

大提顿公园的叉角羚更值得注意，是因为它们的迁徙路线一成不变，并受到三个关键地点(“捕捉器地点”、“红山”和“漏斗”)的严重威胁。