Three new studies examine how anthropogenic sounds impact birds. Urban parks and other green spaces most impacted by noise host fewer species of birds than quieter ones, according to research by the University of the Americas in Puebla, Mexico and the Basque Institute for Agricultural Research and Development (Neiker-Tecnalia), in Usurbil, Spain. The study was conducted in urban parks, main squares, university campuses, natural reserves, and cemeteries in metropolitan Puebla-Cholula, Mexico. "The urban parks had average noise levels ranging between 62 and 72 dB; squares, between 54.5 and 62 dB, and university campuses, between 53 and 58.5 dB," the researchers reported in the journal Landscape and Urban Planning. "The lowest average levels were recorded in a protected natural area, where the measurement was 38.4 dB. The two cemeteries included in the study were quiet places as well, with an average of 45 dB."
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