Saw 5 individuals. They were silent during the foraging. If the number of siskin over 20, some calls are heard during the foraging. The case I saw this time is bellow. A maybe-Ad male fly to the top blanch of Japanese green alder. But other flock member not followed and he was left alone. Then, he calls "tyui- tyui- tyui- tyai-" and continue about 1min, and an flock member replied "tyui-". When he heard, he looks calm. After that, a 1w female come to there and foraged together. It is lucky to see the bird's mind. I think this individual feel fear and anxiety.
Come to the place maybe-ad male calls was this individual. She passes the her first winter and she will experience her first breading season. I hope her to become happy. My 500mm come back from repairing, but spring vacation leave one day only.