The Autonomous Province of Trento passed a law in 1967 to protect the Brenta Group as part of the Parco Naturale Adamello-Brenta. This area covers 650 km2. Its fauna is among the richest of the Alps and includes all animal species which find their habitat on the mountains; bear, chamois and alpine ibex included. The Brenta Group was one of the last places in Italy where endemic bears (Ursus arctos) could find a habitat. Their numbers have recently grown, also as a result of the strengthening of the population by mixing in bears from Slovenia. Approximately 30 bears populate the park. The golden eagle (Aquila chrysaetos) and the wood grouse (Tetrao urogallus) find a protected home in these mountains. At several locations there are colonies of alpine marmots (Marmota marmot).