I had a friend in college and he made a list
  of starling imitations.  I believe that he was up
  to 53 by summer of that year.
  Larry Herbert,  Joplin, Jasper County, MO.
The Audubon Society of Missouri's Wild Bird Discussion Forum
ASM Spring Meeting: April 27, 2012 in Joplin, MO
ABA Birding Code of Ethics