From Buller's <i>Birds of New Zealand</i>: North Island Kōkako <i><a href="//commons.wikimedia.org/wiki/Category:Callaeas_wilsoni" title="Category:Callaeas wilsoni">Callaeas wilsoni</a></i> (syn. <i>Glaucopis wilsoni</i>; left) has blue wattles, and South Island Kōkako <i><a href="//commons.wikimedia.org/wiki/Category:Callaeas_cinereus" title="Category:Callaeas cinereus">Callaeas cinereus</a></i> (syn. <i>Glaucopis cinerea</i>; right) has orange wattles.
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