ajohn

They're easiest to see at Kam Tin, where they spend the whole winter, but you sometimes need to know where to look. The Kam Tin Main Drainage Channel has been the best spot for the last couple of years (since the Buffalo Fields were filled) - try the area close to the Castle Peak Road bridge (i.e. furthest from Kam Tin town, before you reach Nam Sang Wai) or the nearby meanders, preferably at low tide.
There were at least 13 back at KT last week.