Escalating machinery and herbicide costs have made economical brush control difficult. But a growing number of enterprising ranchers are turning to Mother Nature for help. Managed properly, a herd of goats can control brush and improve pastures. Since they prefer the leaves of brush and low-quality forage to the lush grass that cattle favor, the concept of brush control with goats is to "over-graze" the brush. By removing the canopy repeatedly, brushy plants are weakened until the plant must draw on its reserves. Eventually the reserves run out and the plant dies. The goats must be confined to a pasture small enough that they will browse the same plants long enough to create damage, then rotated to the next pasture. Goats left on the open range are easy targets for predators, but guard dogs or llamas provide excellent, low-maintenance protection.