Observe their be'avior. Take for a start the sheeps' tendency to 'op about the field on their 'ind legs. Now witness their attmpts to fly from tree to tree. One thing is for sure, the sheep is not a creature of the air. They have enormous difficulty in the comparatively simple act of perchin'.
Trouble is, sheep are very dim.
Once they get an idea in their 'eads, there's no shiftin' it. And that's a depressing prospect for an ambitious sheep. Well, a couple months back there was this trial in the West Virginia courts. A man was being tried for fornicating with a sheep, since that's illegal an' all. Anyway, the key witness was an old fella who was walking along the highway by the farm where the sheep was raised.