Caper white

Belenois java

"Belenois java", the caper white or common white, is a small butterfly of the family Pieridae found in Australia, Indonesia, and Melanesia. It is highly migratory and is often confused with the cabbage white.
Australian caper white In spring many caper white butterflies migrate to where caper shrubs and creepers are more common. They usually fly inland, west of the Great Dividing Range, but a westerly wind may blow them off course and they may then be seen by people such as myself living along the coast. 

The larvae eat only plants belonging to the caper family Capparaceae including native capers and warrior bushes.

Around 55 mm wing diameter. 

This is specifically Belenois java ssp. teutonia.
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Behavior

Eggs are laid in groups on the top of the host plant's leaves. The caterpillar feeds on currant bush, scrub caper berry, dog cape, nipa, Australian native orange, wild orange, Australian native caper and bush orange. Unlike other caterpillars of its size the "B. java" feeds on a fairly minimal amount of food, making it less of an agricultural pest than the others. The caterpillars feed for about three weeks until fully grown and pupate. They emerge around December in much of their range.

References:

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Taxonomy
KingdomAnimalia
DivisionArthropoda
ClassInsecta
OrderLepidoptera
FamilyPieridae
GenusBelenois
SpeciesB. java
Photographed in
Australia