The Brown Gerygone is a very rare vagrant to Canberra, seen every couple of years. Their usual range is very much restricted to coastal rainforest and forest, even though Canberra is only a couple of hundred kilometers from the coast. A couple of years ago there was even breeding attempted by several birds.
Whenever they turn up in Canberra, they always seem to turn up in the Botanic Gardens. Which is fair enough, as the rainforest gully in the Gardens is probably the closest to their usual coastal rainforest habitat.
This was the first time I had seen this species in the ACT, so I was very glad to catch up with it. At around 9am is was actually fairly easy to find (given that others had found it quite hard), and it was calling quite regularly. It's call is more insect-like than other gerygones, and sounds something like "but-which-is-it", repeated. Later in the day, just after noon, it was a lot more silent, and thus harder to find.
Forgive the quality here---ISO 1250 on a very cloudy morning. However, I think it turned out OK given the lack of light and the dark habitat it was in. Using fill flash as well, of course.