It's not just Po Toi - all of Hong Kong seems to have very good autumn passage this year, especially over the last few days. And it's not just birds - the populations of migratory butterflies also seem high this autumn. At Mai Po this week there has been very obvious movements of migrating drongos, pipits, bee-eaters and butterflies.
I'm not sure of the reasons. It may be that many species have had a good breeding season further north. I think the weather this week has also helped - the fine weather with moderate winds from the north or north-east has provided ideal conditions for migrants moving south through China. The downside is that it may not force birds to stop, so many birds can be expected to only be seen for a short time (as with the Rosy Starling on Po Toi). Similar weather looks set to continue for the next few days, so there will hopefully be more birds around over the coming few days.
