Severino raised pigs, goats, oxen, mules, burros, horses and sheep. Philmont is a working ranch, maintaining small herds of cattle, horses, burros, and bison. Horses, along with mules and burros, also serve as pack animals. Bighorn sheep, red-tailed hawks, and wild burros may be seen. Among donkeys, burros tend to be on the small side. Many other species of grazers, including mules and burros, are not affected. The BLM manages free-roaming horses and burros on public lands in ten western states. Burros and horses were only eaten in emergencies. This act prohibited capture, injury, or disturbance of free-roaming horses and burros. Wild burros are a familiar sight, as are rabbits and ground squirrels. They have no known predators, but humans and burros compete for habitat. The brands on the burros are recognized as those sold to three prospectors months before. Small groups of the burros can often be found roaming among the ruins of Marietta. Further south, there are also the Ring site, and the Quebrada Los Burros. It was recorded in a newly built studio located on Punta Burros, Nayarit, Mexico.