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The article discusses the avian assemblages of the altered and natural grasslands in the Northern Campos of Uruguay. It states the significance of the natural grasslands for the conservation of habitat specialists. It also highlights the population-density patterns of various bird species. As stated, bird assemblages in cultivated and natural grasslands can be characterized in four different agricultural schemes. Classification of grassland-facultative birds was also taken into account. It is believed that differences in the bird community vary between the habitats in cultivated and natural grasslands.