They do, but I am assuming you wanted actual reasons, so here are ours.
1. They are easy on the ground. Try keeping no bare soil with horses or cows, almost impossible. First rain the larger animals will stomp a mud hole, which is fine if your building a
pond I suppose.
2. They are browsing foragers. They eat much like a
deer. I have watched hundreds of deer from a tree stand and they are very much like goats. They eat here walk over there, eat there, walk back here eat this. Smell that and pass it over then walk back and eat 4 leaves off the thing they just passed up 2 minutes ago.
3. They eat almost anything (pro and con) they will eat all those nasty briars for you, or that gnarly Osage Orange tree, thorns and all. But they will also eat your shirt or the checkbook sticking out of your back pocket. (ask me how I know)
4. They are relative easy keepers (debatable of
course) Like any other prey animal, you MUST watch them, know their normal routines. If you just
feed and
water them daily and don't watch them, by the time you notice them out of sorts, they are probably too far gone. Animals that get eaten by other animals are very good at hiding illness and disease.
5. They fit very well in our geography and climate. We are mostly wooded, rocky in places. Not too hot in the summer, not to cold in the winter. 48-ish inches of rain per year, a good long growing season, few predators large
enough to take an adult goat, and plenty of steep hollers they love running up and down.
6. They can clear places you would never get a
tractor or mower, never want to take a weedeater, and do it fairly quietly (unless you have nubians!), without using one single ounce of a fossil fuel.
And they do all this while giving us awesome pelletized fertilizer that needs very little if any composting, yummy milk that is good to drink, makes great ice cream and cheese, and that even most lactose intolerant people can consume due to the difference in the fat molecules. Oh, and every animal on our farm will gladly drink extra milk or milk we dropped a hair or bug in, even the plants enjoy it
--Kurt