These men, immediately after having had their supper, drive the animals to a place where suitable pasture is found, never very far from the camp, and bring them back in the morning.

They constitute what is called la sabana.

Comparatively few men suffice for this duty, even with a large herd, as long as they have with them a leader of the mules, a mare, preferably a white one.

She may be taken along solely for this purpose, as she is often too old for any other work.

The mules not infrequently show something like a fanatic attachment for their yegua, and follow blindly where they hear the tinkling of the bell, which is invariably attached to her neck.