This is the amazing Brown Wood Owl (Strix leptogrammica).
As far as I know, there is only one of these wonderful birds that lives in Hong Kong, somewhere in the forest about Kadoorie Farm. This species is a part of the family of owls known as typical owls (Strigidae), which contains most species of owl. It belongs to the earless owl genus Strix.
This wonderful creature is actually quite big (45–57 cm), with upperparts uniformly dark brown, with faint white spotting on the shoulders. The eyes are dark brown, and very difficult to photograph, as they are primarily nocturnal.