Hi Flash, Just a little bit of info I just picked up.
Quote)
Drongos are altitudinal and latitudinal migrants.
In the high altitude areas around Brisbane, Qld, Australia, they arrive in late spring and leave with their new crop of juveniles in early to mid-summer. Nests are cup shaped in open spaces, where it is difficult for predators to access without being seen, 75% up the canopy. Each year, they produce 3-5 young.
Seeing as we are heading into Winter,maybe they got their seasons mixed up

Cheers