“In recent days, visitors to the city have been surprised to see pigeons sporting plumages that would do credit to a tropical parrot: green and yellow pigeons; pigeons whose feathers radiate electric blue or strident vermillion; even pigeons that seem to be robed in imperial purple. … [The] coloured birds were the work of a Swiss artist, Julian Charrière, and a German photographer, Julius von Bismark.” Some animal rights activists, however, are not charmed.