On my way going back to Sapporo via Tokyo, I had enough time of birding in Kanto (around Tokyo), I tried to seek three stray birds I got information.
At first I went to Sagami river, Kanagawa prefecture for Chinese Merganser which lived in north east Russia and Chinese.
A young male Chinese Marganser was in flock of Common Merganser.
I heard it is difficult to see because it flew away to up or downstream constantly, so I was lucky.
After observation its floating water they flew away to downstream.
Soon I moved to Edo river, Chiba prefecture to see Red-breasted Frycatcher and Goledn-crowned Sparrow.
I beared until appearing of it. It was seen before my deadline...