I wonder if any of these jeenyuses had enough sense to do a study on what foods the sheep were eating, what were available 24 years ago and in what relative abundance versus today? I doubt if the sheep subsist on just grass. Even if they do, they are many varieties of grass. Some would be better food sources than others. I think what we are looking at here is another Kaibab waiting to happen.
Hmmm, introduced from somewhere else to a place where they were not native? To be a valid indicator of GW wouldn't all populations of those sheep have to be shrinking alike? Not just the transplanted population. Have they never heard of adaptive radiation?