The plants and animals that live in grasslands are connected through an unlimited web of interactions. But the removal of key species—such as buffalo and prairie dogs within the American West—and introduction of invasive species, like cane toads in northern Australia, have disrupted the balance in these ecosystems and damaged a number of other species. Grasslands are home to a number of the foremost magnificent animals on the planet - elephants, bison, lions - and hunters have found them to be enticing prey. But when hunting isn't controlled or is conducted illegally, species can become extinct.