Male and female white-backed magpies.
The female white-backed magpie has less white over her shoulders than the male bird. White-backed magpies can be one of two subspecies: the larger G.t. tyrannica (introduced from south-east Australia to the North Island) and the smaller G.t. hypoleuca (introduced from Tasmania to parts of the South Island). Another sub-species, a black-backed form, seems more prevalent around the Hawke’s Bay
Photograph: © Peter Reese by Peter Reese