This is a very angry little bird!
He is one of the White-plumed Honeyeaters whose territory encompasses my garden.
They had just repelled a small flock of New Holland Honeyeaters which occasionally stage a nectar-gathering raid, leading to a noisy confrontation.
The little warrior was still flying back and forth above my roof on the look-out for enemy stragglers.
I don't speak Honeyeater, but I'm ALMOST sure I heard him say, "and that goes for your cat, too!"