Black-thighed Falconet (Microhierax fringillarius)
Nesting at the same dead coconut tree as the Common Myna that I posted previously, but at the opposite side facing north.
"The Nest is built inside an abandoned woodpecker or barbet hole".
(Reference: A Photographic Guide to the Birds of Southeast Asia - by By Morten Strange)
I didn't have a time to wait for the bird flying in to bring the foods nor did I manage to see the chicks.