Very interesting Martin, given the generally lower Koel activity this season described by many observers in Canberra. My local patch (and a few others) has been an exception,
the adults were the most active they’ve ever been pre-Xmas and have continued to be so since we got back over the past weekend.
However, no fledglings yet, nor as far as I’m aware elsewhere in Canberra. One theory that has been advanced for the apparent return to conditions which prevailed a couple of
years ago has been the lack of food (both fruit and also insects for the host feeding fledglings), this may also be the reason why they are advancing further afield.