In Hong Kong, this swallow is recorded most often from autumn into winter. It flies over lowland fish ponds and catches insects in the air.
The Hong Kong subspecies has a blue-black back, an orange rump and nape, and fine dark streaks on the belly.
Loose flocks forage over fish ponds, catching insects in flight. It is common in Hong Kong during passage, while breeding there is scarce.
An extinction-risk assessment has not been added yet.