Hector Galbraith also wrote up a nice summary of Black Vulture records 
in Vermont through 2007.  You can see his work on the VT Bird Records 
Committee website:

Since 2007, the species has become sufficiently "common" that the 
committee is no longer soliciting rare species documentation forms.  
Also, you can go to eBird and get a summary of the more recent records.


Gregory Askew wrote:
> In speculating on what contributed to the northward expansion of Black
> Vultures, I wondered if the creation of the interstate highway system
> during the 1950s and 60s, with its resultant increase in road kills of
> large animals might have played a significant role. So I browsed the
> internet for research...Some of the sources reference different
> decades in which the expansion began, which makes my hypothesis more
> tenuous. However, this abstract from JSTOR sets the time about right
> for the construction of such major interstate highways as I-95...a
> relative straight-shot from Florida and Georgia, the historic
> northerly range of Black Vultures, to New England. The article also
> draws a correlation between the vulture's expansion and an increase in
> White-Tailed Deer population in the east.
> Interesting stuff...and, as usual, it all leads back to changes we have wrought.
> Here are some of the other webpages I found:
> Greg
> Vergennes


Allan M. Strong
University of Vermont
The Rubenstein School of Environment and Natural Resources
347 Aiken Center
Burlington, VT 05405