I had to go to Frederick today for non-birding related reasons, but took the time to stop by Baker's Park to check the rookery and was happy to count carefully 12 Black-crowned Night-Herons. Most were just resting but one pair was courting and nest building. I uploaded a few photos. 
 
http://www.flickr.com/photos/thrasher72/5584072334/ 
 
Take care, 
Jon Corcoran 
Catonsville, MD 
 
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