I would be disappointed if I had less than 20 species when I walk my dog each morning, typically no more than thirty minutes. If I had headphones on and kept my eyes on the ground I think I'd still beat one species. At minimum I would trip over a tree sparrow and a spotted dove. Even at night I typically get more than one species. My Yung Shue O records now stand at 136 species since December 2013. Yung Shue O also lies within Sai Kung West CP and Hoi Ha is most likely better in terms of habitat.
It would be interesting to know what the one species was!
Dylan