I also watched for the WWx-bills at Centennial, between 11:00 and 11:30 
  and again between 2:00 and 2:30 - but saw no sign of them.

Moving on to Druid Rdge cemetery between-times at ~ 1:00, I did not see 
them at first, but within 15 min a flock of ~ 40, mostly f/i, arrived at 
a mid-point in the line of hemlocks and afforded good views for at least 
an hour, despite the wind. As others have mentioned, the rain of cone 
debris is a tell-tale sign of their presence - at least if there are 
enough of them.

Thanks to another birder, Jeff (sorry I missed the last name), for 
relating the history of their presence there. Two groundsmen stopped out 
of curiosity and chatted with us a while, showing a lively interest in 
the birds.

Fred Fallon
Huntingtown

Felicia Lovelett wrote:

> At 1:15 PM today, there were at least 4 White-winged Crossbills on the
> spruce trees at the South Area (Rt. 108) Centennial Park entrance.
> 
> They were foraging low in the branches of the 4th & 5th tree to the right of
> the park entrance.
> 
> Felicia Lovelett
> Sykesville, MD
>