Large Flocks of Starling-like birds in yard, eating grubs
(Ancaster, Ontario, Canada)
They look a lot like European Starlings, as they are speckled in the same pattern as a starling, but do not seem to possess the same yellow bill of starlings. Unless the entire flock consists of females, there are no noticeable differences in colouration of males and females. While the colouration suggests female starlings, and they do have yellow legs and feet, their heads look more like an American Robin in shape, but they are quite a bit more rounder than the average starling, though this may be due to them fatening up to prepare for the coming winter months. I didn't have enough time to take a picture, but they descended upon the yard in a huge flock, at least 50 individuals, moved across the yard, pulling out grubs (we have a lot of crane flies and grubs in the area) and then they flew off after about 10 minutes.
Pretty sure they are starlings. Their bills are yellow in the summer when they are breeding, (and they love to breed!) but in winter they are brown.