[Owls] Breeding record of Collared Scops Owl

I don't think owls dig their own tree hole, they only use existing holes or nest boxes provided as far as I know. There are really not a lot of natural tree holes in HK, the trees in many locations are not mature enough in general. So, most owls uses nest boxes provided by people. But a hole on the ground...this is the first time I have ever heard Collard Scops building nests on ground level.
As The Crow Flies- a Hong Kong Birding Blog