Egypt has a long history, beginning as separate city-states along the Nile that eventually united under a single ruler in Upper Egypt. The pyramids built by ancient Egyptians are one of the seven wonders of the world. Egypt spans both North Africa and the Sinai Peninsula in Asia. Cairo is a center for Arabic movies and music, while the majority of Egyptians speak Arabic and follow Islam, with a minority of Copts who are Christian descendants of Egypt's earliest Christians. The fauna of Egypt includes gazelles, foxes, jerboas, hyenas, jackals, hippos, and crocodiles.