Asian dollarbird, Oriental dollarbird in flight

I have seen his blue bird making a hole in the coconut tree trunk in Temerloh., but this is the first time in Raub. I think this bird came from the nearby hill of a rubber plantation.

Oriental dollarbird (Eurystomus orientalis orientalis)

then turning back to the rubber plantation.

In flight has a characteristic white circle, or ‘dollar’, on each under wing.