Daphnis nerii

Seen it for the first time feeding on Catharanthus roseus (Madagascar periwinkle- white). It's not wild, a garden/ornamental species planted in the society. Usually seen it feeing on Nerium oleandar and Tabernaemontana species (Crepe Jasmine) . Evidence of feeding is clear with frass and the size is not fully grown adult (in case it wandered away from host plant). The nearest other host plants are at least 40-50 mts away