Northern Cardinals built a nest one spring in my backyard in Minnesota. I
discovered it one day while working around the bush they were in. Prior to
my discovery, they had never paid any attention to me; but once they "saw"
that I had "seen," they were on constant alert to me, chipping loudly and
harassing me every time I walked into the back yard. They never bothered my
children or my husband. There was no question that they recognized me, and
that they knew that I knew.

Nancy Hertzel
Tacoma
autumn207 at comcast.net