Bowing to pressure from groups both inside and outside the state, the Texas Parks and Wildlife Department announced that it is suspending the killing of wild burros in Big Bend Ranch State Park. The department will work with the Humane Society of the United States to find other ways to control the burro population, which it says threatens the purity of the park’s water sources and destroys native plants. Since the policy was instituted in 2007, about 130 burros have been killed. The agencies will conduct a study of the size and location of the population and then consult on strategies for removing the burros.