Ah, I forgot that, after scientific work, the leafbirds have been reclassified and ours in HK is now “
Greyish-crowned Leafbird”
Chloropsis lazulina.
For HK birding purposes, same bird, new name
It can be worth downloading the HK species list, also from this website
http://www.hkbws.org.hk/BBS/viewthread.php?tid=30612