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The chatarreros are Barcelona’s itinerant scrap-metal collectors, and there are thousands of them. Most are undocumented migrants and so there is no official census, but Federico Demaria, a social scientist at the University of Barcelona who is conducting a study of the informal recyclers in Catalonia, believes there are between 50,000 and 100,000 in the region. About half are from sub-Saharan Africa; the rest are from eastern Europe, elsewhere in Africa and Spain.