Return of wolves to Yellowstone has led to a surge in aspen trees
Wolves were reintroduced to Yellowstone in 1995, over 60 years after their eradication from the national park. Yellowstone's wolves are helping a new generation of young aspen trees to grow tall and join the forest canopy — the first new generation of such trees in Yellowstone's northern range in 80 years. Gray wolves (Canis lupus) had disappeared from Yellowstone National Park by 1930 following extensive habitat loss, human hunting and government eradication programs. Without these top predat