If the bill is not really as short and tiny as it appear in the picture 
I'd say it was an imm Bluebird.

Jenny McClintock wrote:

> Hello all!
> 
> I am looking for some help ID'ing a mystery bird at my feeders over the last few days. This bird is always with the large flock of House Sparrows and is half-again as large as they are. He definitly appears to be a mis-matched part of the flock. The other day, I noticed him going beak-to-beak several times with a female HS, it appeared as if she were feeding him. 
> 
> He is gray-brown overall, with a speckled breast, a dark wing bar (scapular or coverts?), a darker slightly rounded and forked tail, and his beak is thicker than the sparrows and the top is slightly darker than the bottom.
> 
> I have posted some pictures here. They are not very good, but hopefully some expert bird detectives out there can give me a guess as to who he may be.
> 
> Thanks!
> 
> Jenny McClintock
> Columbia
> 
> http://home.comcast.net/~mcclintock7/mysterybird.htm
> 

-- 
Fred Fallon
Bowie MD