There are numerous races and/or subspecies of Silvereye, with the forms common in Western Australia showing a green back with no contrast to the back of the neck.
Eastern Australian birds, and those found in New Zealand, tend to be more colourful with a slate grey back and orange flanks.
Silvereyes are a relatively recent addition to the native bird fauna of New Zealand, and apparently it wasn't until the 1850's that they arrived en force from Australia and set up a permanent colony. Nowadays, it is one of New Zealand's commonest landbirds.
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