Google Headquarters hit the news today because they have begun using goats as "lawn mowers." Yes, I admit that makes them "green," as they say. But the trend isn't new. In the 1800s, our township cemeteries were mowed that way, and some Amish cemeteries still are (although in both cases, sheep are preferred).
And in 1981, after my husband's heart surgery and my own back problems made it hard for us to maintain a certain portion of our property, we purchased a few sheep to do the job.
It drew a lot of attention, some of it scathing, but the results were beautiful. And we were able to sell the sheep back in the fall, for just what we'd paid for them... avoiding the expense of feeding the animals in the winter.
R.A.T. (Rose About Town) and her hubby were way ahead of the curve.