I have lived in a largish woods off Seneca Road for eighteen years.   
During that time, the deer have thoroughly eaten out the understory as Paul  
O'Brien has observed.  Missing from the woods since my first spring here in  
1992:
 
        Blue-grey  Gnatcatchers
        Kentucky Warblers
        Ovenbird
        Red-eyed Vireos
        Scarlet Tanagers
        Louisiana  Waterthrushes
        Acadian Flycatchers
        Eastern Wood Pewee
 
 
Some of the above birds are canopy birds, so their absence makes no sense  
to me.  But gone they are, for whatever reason.

 
In addition, I have heard the Wood Thrushes only occasionally this  spring. 
 I think they are nesting nearby, but there used to be a chorus of  them 
daily, with multiple breeders.  I used to see the other thrushes as  they 
migrated through.  This year: none, other than robins.
 
Last winter's snowmageddon wiped out the Carolinas too.  They were  doing 
OK with my suet until I took a trip at the tail end of the time snow was  
deep and that apparently finished them off.  In this case, they ought to  soon 
be back, because they survived along the canal not far away.
 
Bob Mumford
Darnestown