Home Migrants

The last two days I've found spring migrants (birds) feeding in my green ash at home. I imagine with the cold temperatures (down to freezing) birds are having a difficult time finding insects to eat. Our ash tree seems to be an exception...it is the home for aphid-like insects...it is a phenomenon repeated annually. Many times these insects are massed at the base of the tree trunk, a whitish-silver pile. Somehow birds find this single tree and find copious amounts of these bugs on the buds/twigs and lodged in crevices. Can you identify the bird species in the photos below?