Hey everyone, the consensus seems to be that the bird 
visiting our feeders was indeed an Inca Dove, and it fits a 
pattern of vagrancy for a few other birds this past week.

I have been advised to see if the bird returns and determine 
whether it establishes a regular visiting pattern.  If so, 
then a decision will be made about allowing limited visits.

Thanks for all your help and advice.  It has been an 
exciting week for Maryland birding!

--Derek

-- 
Derek C. Richardson, College Park, PG County, MD
http://www.astro.umd.edu/~dcr/Archives/Photos/birds.html