The animated map depicting Eurasian Collared-Dove expansion (see link
below) seems to indicate that most individuals of this species have a
strong tendency to move westward and some sort of disinclination to
moving in a north or northeast direction. While western and
northwestern parts of the US and Canada are now widely populated by
Eurasian Collared-Dove, it wasn't until they had inched their way
northward to the Florida panhandle in 1997 that they rapidly flooded
westward. During and after this time they did not similarly flood
north or northeast, and the species still appears to be uncommon in
New England, and unheard of in eastern Canadian provinces.

http://i368.photobucket.com/albums/oo125/wmpulliam/EuCDov1984-2010.gif?t=1290181108


Scott R
Yakima, WA
mryakima at gmail dot com