Sun Chong Hong’s video of a White-throated Kingfisher (Halcyon smyrnensis) perching on the roof of a house vocalising shows the bird making a possible distress call. What caused its distress? The sudden appearance of a number of House Crows (Corvus splendens) and Asian Koels (Eudynamys scolopacea), and of course Chong Hong himself.
In making its call, the kingfisher stretched out its neck, lifted its head upwards, opens the mandibles and started calling. The throat can be seen inflating and vibrating. The body can be seen vibrating too.
Attached are two other audio recordings of calls made by the White-throated Kingfishers. The familiar territorial/distraction call is HERE, while a similar call to the one in the video clip, but with the ending part sounding different is HERE.