Among the greatest causes of natural and cultural resource damage within Big Bend National Park are the herds of free-roaming trespass livestock that enter the park along the 118 miles of international border and remote park boundaries. The park recently stepped up its efforts to combat this problem by conducting periodic roundups. During this past winter, season park staff removed 112 animals, including horses, cattle, and burros. Captured animals were quarantine and transferred to USDA. The work is conducted primarily on horseback and park employees with good equestrian skills from all divisions participated.