Mankind, and particularly the knitting world, has every reason to be grateful to sheep as they provide us with wool. And where would we be without wool? Sheep have an undeserved reputation for being none-too-bright, but recent studies have proved them to be cleverer than rats. They have been described by one research scientist as being ‘as intelligent as a slow monkey’. Sheep in Yorkshire have been spotted rolling across a cattle grid, proving their ingenuity.