There is a place in Arabia not far from the town of Buto where I went to learn about the winged serpents. When I arrived there, I saw innumerable bones and backbones of serpents: many heaps of backbones, great and small and even smaller. This place, where the backbones lay scattered, is where a narrow mountain pass opens into a great plain, which adjoins the plain of Egypt . Winged serpents are said to fly from Arabia at the beginning of spring, making for Egypt ; but the ibis birds encounter the invaders in this pass and kill them. The Arabians say that the ibis is greatly honored by the Egyptians for this service, and the Egyptians give the same reason for honoring these birds.