Was it a good idea to reintroduce wolves into Yellowstone National Park? 🐺 After being wiped out nearly 70 years earlier, wolves were brought back, and the impact was dramatic. Elk populations dropped, allowing plants like willow and aspen to thrive again. That led to the return of beavers, songbirds, and fish habitats: a textbook case of a trophic cascade, where changes at the top of the food chain ripple through the entire ecosystem. But ecologists point out that wolves weren’t the only preda