I saw a male American redstart from my window do his dramatic drop.  
 
Also saw what I believe was a pine warbler, 5 inch olive bird with bright yellow throat and breast.  It moved too fast flitting and hopping from branch to branch in the toweing ivy-covered pine for me to get more detail.  Does that behavior suggest it could have been a yellow-bellied flycatcher?  
 
Also saw a WB nuthatch which I haven't been seeing in the yard this summer.  
 
I took Les Eastman's suggestion after I saw a female ruby-throated hummingbird pass by my metal flower feeder for some morning glories. Within an hour of putting up the 4-port 8 oz. pinched waist Pretty Pet model he recommended, I had two fighting over it.
 
Dorothy Paugh
Bowie, MD