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WikiPedia: Phân chim http://uwo.academia.edu/PaulSzpak/Papers/1601815/S... //dx.doi.org/10.1371%2Fjournal.pone.0033741 http://www.jamaicancaves.org/jamaican_bat_guano.ht... http://www.agrorural.gob.pe/index.php/programas/pr... http://www.bbc.co.uk/dna/ptop/A765678 https://commons.wikimedia.org/wiki/Category:Guano?...