According to much of the data that we read, the Laughing Kookaburra (Dacelo novaeguineae) will nest in any hollow that is big enough to fit an adult. Around our way, we only ever see them nesting in arboreal termite mounds (“termitaria” as the birdos like to call them).
In our local parks there is usually no shortage of quite large termitaria, and most of them have the tell-tale holes of Kookaburra nests, either active or abandoned from a previous season.
The Laughing Kookaburra is the largest Kingfisher in the world. Which makes us wonder why this couple of young lovers were excavating a termite nest that was clearly going to be too small for them. Practice, we wondered?