Bighorn sheep formerly inhabited the Wind River Mountains in vast numbers and therefore played a vitally important ecological roll in the entire ecosystem. However, by 1900 many formerly abundant herds had declined to the point of near extinction. In the early 1960’s, at the behest of a concerned and insistent public, the Wyoming Game and Fish Department began restoring bighorn sheep populations in the southern Wind River Mountains. However, within the last decade the translocated bighorn sheep inhabiting Sinks Canyon and the Middle Fork of the Popo Agie River have completely died out, most likely the result of bronchopneumonia contracted from an unfortunate accidental contact with a small hobby flock of domestic sheep present near the canyon during a short four month period. Currently only three tiny, isolated populations of bighorn sheep exist in the Little Popo Agie, North Fork of the Popo Agie, and the adjacent South Fork of the Little Wind River Watersheds. Without prompt agency intervention, the imminent extinction of these small, isolated populations is all but assured.