by Alexis Hayes
(Markham, Ontario, Canada)
Photographed May 12/2012 in Markham Ontario.What a lovely picture Alexis, this is beautiful - I didn't even know there was a Blackburnian Warbler!
They are, of course, named after Anna Blackburne who was an English botanist.
According to Wikipedia, Blackburnian Warblers are solitary during winter and highly territorial on their breeding grounds and do not mix with other passerine species outside of the migratory period. However, during migration, they often join local mixed foraging flocks of species such as Chickadees, Kinglets and Nuthatches. They are insectivores but will occasionally eat berries.