Compost

First came the animals. Then came the plant life. Now, there's a new appreciation for their poop that's getting tilled into the many gardens that crop-up. Also, a wheel barrow-full should regularly get under some pine trees that had to be put in gravely driveway. Camelids make it easier to collect than the cows since it's in regular piles. Homes should maintain livestock if for no other reason than to fertilize plant life.