The endangered Copper Wing Butterfly is restricted to altitudes above 900m. It occurs in small populations in the Blue Mountains region west to Bathurst.
The butterfly is limited to habitats containing its host plant the native Blackthorn (Bursaria spinosa). It has a fascinating mutualistic relation with a native species of ant; the ants attend to the butterfly larve and protect them from predation and the pupae of the butterfly also protected underground in the ants nest. The ants in turn benefit from a secrection produced by the larvae.
The Copper Wing Butterfly is threatened by loss of habitat and by invasive weed species. AEFI contributes to the management of a small population of these butterflies at Secret Creek Sanctuary but another important site containing a larger population has been identified nearby in Lithgow.