In 1995 Yellowstone began bringing back wolves; 30 years later young aspens returned, but the wider recovery remains uneven

• Representative image of wolves in Yellowstone National Park (AI-generated)Three decades after wolves returned to Yellowstone National Park, young aspen trees are growing tall in parts of the park’s northern range for the first time in generations.
• The change has added fresh evidence to one of conservation’s best-known stories, but scientists say the results are more complicated than the popular version suggests.
• The United States began restoring wolves to Yellowstone in January 1995.