It was brought to my attention that I should have included some notes in my 
original post on how I determined the chickadee I had on Sunday (Jan 2nd) in 
Kent County to be a Black-capped and not a Carolina.  I took notes in the field 
and was of course planning on submitting them when I entered the list into 
eBird.  As others on the MDOsprey have mentioned, in order to accurately 
document the BCCH invasion into Maryland we should be extra careful when 
identifying chickadees and take notes in the field and get pictures when 
possible. If I had been better prepared I could of easily taken a few pictures. 
Below are the notes I took after the observation.

-large all white auriculars
-jagged edge to bib
-whitish area below bib before buffy belly
-white on inner greater covs
-white on outer edge of terts, bold and extensive
-larger in size that nearby CACHs, easily picked out by naked eye
-slower raspier call than CACH, nice comparison as both species were calling at 
the same time
-also, noticeably fewer "dees" compared to CACH

Dan Small
Chestertown, MD