Tony

There was Schrenck's Bittern record in Lung Fu Shan Country Park. But this bird looks really sick...
You may check the bird record of Hung et al. (2006) or thread from wildlife.net

Hung, T. H., S. H. Sung, W. K. Fu and P. Y. Yuen. 2006. The bird fauna of Lung Fu Shan and the University of Hong Kong. Porcupine!, 34: 20-23.