Birds, who once were dinosaurs, could take over the world (again) if they wanted to. And not just in the movies, a la Hitchcock’s 1963 terror, The Birds. (If you haven’t seen the movie, check out this well-edited one-and-a-half-minute version of it.) Not long ago, in Kagoshima, a city on the southern island of Kyushu, in Japan, a booming crow population went on the offensive: destroying power lines and fiber optic cable, being markedly more aggressive with people, and outwitting human “crow patrols” by building decoy nests. In recent years, crows have been filmed using tools in sequence and exhibiting complex reasoning as well.