Wild coffee plants (Coffea species) are thought to have been native to an Ethiopian plateau region known as Kefa (Kaffa), though the exact history of their origin and domestication remains unclear. One of many legends about the discovery of coffee is that of Kaldi, a goatherd who was puzzled by the strange antics of his flock. About 850 CE Kaldi supposedly sampled the berries of the evergreen bush on which the goats were feeding and, on experiencing a sense of exhilaration, proclaimed his discovery.