The white-throated kingfisher (Halcyon smyrnensis) also known as the white-breasted kingfisher.
I also often find this larger bird in Mai Po. This one below appeared when I was taking pictures of a Long-tailed shrike ,and it came and pushed the other bird off its perch.
The song is a loud ringing “kilililili” while its regular call, mostly uttered in flight, is a loud chattering “kra-kra-kra-kra-kra” laugh. The wings in flight are spectacular, and I am keen to try and capture one mid flight (yeah, good luck robert)....
This kingfisher is not tied to water and occupies all kinds of habitats including gardens, parks, homesteads, and woodlands.
Have you seen one?