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WikiPedia: Mỏ_chim //lccn.loc.gov/64013457 //www.worldcat.org/oclc/263166207 https://books.google.com/?id=yU8aAAAAYAAJ&pg=PA1&l... https://www.merriam-webster.com/dictionary/beak https://archive.org/details/birddisplaybehav07arms https://archive.org/details/songsroarsritual00lesl https://commons.wikimedia.org/wiki/Category:Beaks?... https://books.google.com.vn/books?id=DThEAAAAYAAJ&...