Although I haven't been seriously birdwatching on Po Toi for several weeks, I doubt there has been any change in the numbers of resident species.
The following species are resident on Po Toi - Pacific Reef Egret, Black Kite, Spotted Dove, Greater and Lesser Coucal, Red-whiskered and Chinese Bulbul, Long-tailed Shrike, Magpie Robin, Blue Whistling Thrush, Masked Laughingthrush, Common Tailorbird, Crested Myna and Large-billed Crow. Peregrine and Sea Eagle are occasional visitors.
Autumn is usually a quiet time for most of these residents, perhaps because of moulting as Captain says.
Japanese White-eye are not resident and are usually absent in September/October. They will come back in November and mostly depart before next summer. Black-necked Starling and Great Tit are also not resident and rare or totally absent. Greater Coucal are quiet at this time of the year.
[ Last edited by wgeoff at 25/10/2011 16:38 ]