Number observed: 210
Details: See also comments. Extremely clear view in bright twighlight with no obstructing trees. Flying low and effectively north along the Gatineau River. Uniformity of all birds in flock, clear black and white pattern, and characteristic babbly calls of the flock make it clearly distinguishable. This is the 4th flock seen flying north over our Wakefield house in a week; an extremely unusual sight based on almost 20 years living here since 1990 - without seeing a single flock.