What herding system allows animals to roam over a large area and requires little surveillance?

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The extensive herding system allows animals to roam over a large area and requires little surveillance as they are free to graze and move naturally. This is in contrast to intensive herding systems where animals are confined to smaller areas and require more management and supervision. Internal and external are not terms commonly used to describe herding systems.

What Herding System Allows Animals to Roam Over a Large