Now, large herds dung and urinate all over their own food, and they have to keep moving, and it was that movement that prevented the overgrazing of plants, while the periodic trampling ensured good cover of the soil, as we see where a herd has passed.
Però els grans ramats defequen i orinen sobre el seu menjar, així doncs s'han de moure constantment, i va ser aquest moviment el que va prevenir la pastura excessiva de plantes mentre les trepitjades periòdiques asseguraven un bon cobriment de tot el terra, com podem veure on un ramat ha passat.