To  add to what Edge already relayed regarding Blue-headed Vireos.  There are also two December records:
 
http://www.showme-birds.com/index_files/Page1882.htm
 
It is certainly a species Missouri birders should keep an eye out for as we come into the winter months.  They over winter as close as southern Arkansas...
 
Josh

 
Joshua Uffman
St. Louis County, MO
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MO-Records: www.showme-birds.com
Bird Photos: http://www.pbase.com/jpuf
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