Male Rufous Hummingbird.
A reader from down under (does NZ count as down under?) asked, regarding an earlier Rufous Hummingbird post, how I knew the bird in the picture was a female. Here, pictorially, is the answer. The males actually are rufous, unique within the hummingbirds, I believe.
Note also the gorget, the colour-bearing throat feathers, which form a more expansive patch in males of all species. The feathers of the gorget are flat and iridescent. Their bright colour is structural, and when not reflecting light in your direction they appear dark.
Then the bird turns and gives you a blast of colour. Different species reflect different colours. Every so often this will happen unexpectedly-- a flash of scarlet or magenta will catch your eye as an unseen hummingbird perched in a bush turns its head in the sunlight.