Giant Moth

Was out for lunch one weekday and saw this critter on the wall. It was about the size of a palm. Fairly big.  Don't know what species of moth this is.

There is a grandmother's tale that if somebody has recently passed away in the household and one of this giant moth appears in the house, it is the spirit of the deceased visiting the house and should not be killed. 

Nowadays, it quite rare to see this type of moth. In the past, we can see it every now and then in void decks and even in the house. Does it mean there are less people dying nowadays or the moth are dying faster than human are dying?

Anyway, these are beautiful creatures and I hope to see more of them around, spirit or no spirit.