pandas also eat bamboo. bamboo is a weed and if the panda population went extinct the bamboo would grow in large numbers and compete with more important plants like trees and stuff. if they invade the ecosystem then animals that feed on those trees and grasses will have less food, and in turn will die off, giving less meat for carnivores, and less animals to hunt for the locals, who will have to migrate to a big city which will cause more overpopulation
nature has this stuff all planned out. if you forget with the animals they'll forget you right back.