One of the things he noticed was a massive group of Chinese Bulbuls. He estimates the group to be many hundred in number.
Interesting! I've never seen them migrating in flocks.
Migrating flocks of Chinese Bulbuls are a feature of this time of year in HK too.
They were a scarce migrant in Beidahe 25 years ago.
Now they winter in Qinhuangdao, but I didn't notice the number increasing with migrants from the north.