Closer view of the poster describing the San Antonio de la Sierra Park. Note especially the allowed and prohibited activities. You need to have an entrance permit (the brazalete), you are not allowed to bring pets, no hunting etc. But curiously, grazing of cattle is allowed! There were no large grazers in the area prior to the arrival of humans, so clearly this must be having an impact on the vegetation. In fact, there are few places in Mexico where you cannot see evidence of cattle (dung etc).

Closer view of the poster describing the San Antonio de la Sierra Park. Note especially the allowed and prohibited activities. You need to have an entrance permit (the brazalete), you are not allowed to bring pets, no hunting etc. But curiously, grazing of cattle is allowed! There were no large grazers in the area prior to the arrival of humans, so clearly this must be having an impact on the vegetation. In fact, there are few places in Mexico where you cannot see evidence of cattle (dung etc).