In his novel The Terror, Arthur Machen imagined that the animals, sickened by the carnage of World War I, turned on humankind with tooth and claw. Later, Daphne DuMaurier in a story adapted by Alfred Hitchcock thought the birds might strike at people for reasons known only to themselves. In The Happening, director-writer M. Night Shyamalan explores the idea that plants, threatened by our p...