This grassy valley called Estrop (stropia: flock) a been used for pastoral purposes for many a long year: 1500 sheep graze it from August to September. The hut serves as a shelter for the shepherd. The flock rests on the knoll as the abundance of nettles and wild spinach attest. The Alpine grass is a fragile environment where the National Park helps ensure that a biological balance is maintained, while trying to improve the working conditions of shepherds.