Fairy martins are very infrequent visitors to my place. Before Ms Woko & I bought our property fairy martins nested under a rock overhang goodness knows how long ago. About 18 years ago they nested in a road culvert but haven't reappeared until this spring. Last weekend I saw 7 flying in & out of the culvert. I also saw one gathering mud from the creek bed which is fed by the culvert. Nest building is quite on the cards.
These are the very old fairy martin nests:
