Yellowstone wolves may not have reshaped the national park after all

One of the most widely cited stories about Yellowstone's wolves is facing fresh scrutiny.

A new peer reviewed analysis published in Global Ecology and Conservation argues that a high profile 2025 study significantly overstated the ecological impact of wolf recovery in Yellowstone National Park. Researchers from Utah State University and Colorado State University say the earlier work relied on flawed methods that led to exaggerated conclusions about how wolves affected the park's ecosystem.

"Ripple et al. argued that carnivore recovery produced one of the world's strongest trophic cascades," said Dr. Daniel MacNulty, lead author of the new analysis and a wildlife ecologist at Utah State University. "But our re-analysis shows their conclusion is invalid because it relies on circular reasoning and violations of basic modeling assumptions."

Disputed Willow Growth Findings

At the center of the debate is a claim that willow crown volume increased by 1,500 percent following wolf recovery.