Which is most likely a keystone species
Dear, which of variety of plants, including shrubs and young trees, and are consumed by large predators like mountain lions, wolves and bears
Cane toads in Australia, which were introduced to eat, cane beetles, but eat anything and survive in various habitats
Wolf and Yellowstone National Park elk graze on Willows on beavers, depends to build their dams
Feral cats hunt, a wide variety of animals, including birds, lizards, rodents, and insects