Birds flying at sunset. Starting as a single excited shout, the words rippled down the line: "Hoopoe! Hoopoe! Left! Left! Left!" To the uninitiated ear it sounded like the chant of an excited crowd of football fans. But these gasps of delight came from a jovial group of a dozen binocular-wielding Britons doing what they love best -- birdwatching in Europe's avian megalopolis. (AFP/Attila Kisbenedek)