Rough house at the Nature Reserve

My other job is as one of the Sheep Wardens on the Derbyshire Wildlife Trust's Nature Reserve at Hilton, where we have 24 sheep, 3 of them Shetlands(cream) and 21 Hebrideans (black). Their job is to keep down the undergrowth by eating it.
Normally they are pretty placid, but this week some were in a belligerent mood. See video.

Note for Blog Authors.
This video ceased to work after a time, when I first posted it, but Google have now fixed the technical problem. Please post more videos.
This one is a low resolution video from my mobile phone, but quite adequate for the Blog.