Papilio prexaspes prexaspes (Blue Helen)
The Blue Helen

Papilio prexaspes is a migrant from Malaysia and has recently begun to colonise certain areas in the Singapore forest reserves. It was not recorded by the researchers who studied the biodiversity of Singapore's butterflies in the 60's and 70's.  
This butterfly is one of the "Swallowtail" species. The species has a wingspan of about 100-110mm and has a white patch on the hindwing. The Blue Helen
There are blue lunules along the hindwing margins. It feeds on roadside flowers like the Common Asystasia and Lantana. Both these specimens, males, were photographed feeding at roadside seepages and rotting carrion in the nature reserves.
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