Nice, Dave! “Irruption” seems to be the preferred term for these mass movements of young Chickadees. Andrea Patterson posted the following piece on April 18, 2013, about observations of the phenomenon over a number years at Braddock Bay Bird Observatory, where Lake Ontario poses the barrier that the birds pile up against:
https://braddockbaybirdobservatory.wordpress.com/2013/04/18/the-chickadee-migration-continues/ -Geo -- Cayugabirds-L List Info: http://www.NortheastBirding.com/CayugabirdsWELCOME http://www.NortheastBirding.com/CayugabirdsRULES http://www.NortheastBirding.com/CayugabirdsSubscribeConfigurationLeave.htm ARCHIVES: 1) http://www.mail-archive.com/cayugabirds-l@cornell.edu/maillist.html 2) http://www.surfbirds.com/birdingmail/Group/Cayugabirds 3) http://birdingonthe.net/mailinglists/CAYU.html Please submit your observations to eBird: http://ebird.org/content/ebird/ --
