Birders flock here to see rare species Comments Photo by Ralph Hocken The Citrine Wagtail, a native of north Asia, has been spotted in the Comox Valley. It is the first confirmed sighting of the bird in Canada and only the second in North America. NOVEMBER 21, 2012 BY LISE BROADLEY ECHO STAFF Birders are all a-twitter following the sighting of a very rare bird in a farmer's field in Courtenay.…