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The Cerulean Warbler leaves Vermont so early in the season?  When do you think the couple you observed started nest building?  I'm surprised.  
 

> Date: Fri, 24 Jun 2011 09:29:09 -0400
> From: [log in to unmask]
> Subject: [VTBIRD] Cerulean couple
> To: [log in to unmask]
> 
> This morning, while checking in on the Cerulean Warbler that is nearest 
> to my home on the southern end of Snake Mountain, for the first time in 
> the 4 years of observation of the species I recorded a female. It was 
> in companionship with a male, high in the canopy, right in the center of 
> the territory posted by the male by its singing since May 13th.
> 
> Being silent, muted in color, and apparently mostly in the high canopy 
> (where nests, if any, likely would be located), the silent females are 
> difficult to locate in the best of times .... at least where populations 
> are scarce.
> 
> Based on the behavioral patterns of males at my location in previous 
> years, it is about now that the birds begin to stop singing, and may 
> even be preparing for out-migration from Vermont, heading back south. 
> Last year the last day I observed multiple birds was June 17th, and the 
> last bird observed was June 26th. I did not see any birds on that 
> territory last year any day after June 26th through July 17th when I 
> quit daily surveying.
> 
> {By the way, if you view the distribution map in eBird for Cerulean 
> Warbler, you will see pointers at more locations than the birds have 
> been observed ..... leading to an impression that the species is more 
> widespread than it actually is. For example, the markers on the map for 
> three observers seeing the same bird at the same place can show up as 
> three different locations as much as 12 or more miles apart, depending 
> on how they are submitted to eBird. This is an artifact of the eBird 
> reporting process, and is especially magnified for rare species.}
> 
> Ian