Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Alfred Marshall Bailey (18 February 1894 - 25 February 1978) was an American ornithologist who was associated with the Denver Museum of Natural History (now the Denver Museum of Nature and Science) in Colorado for most of his working life. From 1926 to 1927 he was on the staff of the Field Museum of Natural History in Chicago, during which period he took part in an expedition to the Semien Mountains of Ethiopia. From 1927 to 1936 he was Director of the Chicago Academy of Sciences. Bailey returned to the Denver Museum as Director in 1936, a position he served in for over thirty years, eventually retiring in 1969 at the age of 75. Bailey died in Denver at the age of 84. He is honoured in the scientific name of the Sierra Madre Sparrow (Xenospiza baileyi), collected by him in Mexico and described by Outram Bangs in 1931, as well as in the name of Bailey's Shrew (Crocidura baileyi) of which he collected the type specimen in Ethiopia, to which it is endemic.

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