Caper White Butterfly (Belenois java) feeding on Cattlebush, Stubbs Waterhole, Arkaroola in mid winter. Caper White Butterflies are a migratory species breeding inland on caper bushes (various species of the genus Capparis such as the Iga) and Australian Sandalwood. In some years, the adults disperse towards the coast as far south as Tasmania despite their food source being largely confined to semi arid locations such as the Flinders Ranges. More information on the Caper White Butterfly here.
Also seen feeding on Cattlebush is the Australian Lesser Wanderer Butterfly.