Sacred Kingfisher.

The Sacred Kingfisher is a medium sized kingfisher. It has a turquoise back, turquoise blue rump and tail, buff-white underparts and a broad cream collar. There is a broad black eye stripe extending from bill to nape of neck. Both sexes are similar, although the female is generally lighter with duller upper parts. Young birds are similar to the female, but have varying amounts of rusty-brown edging to feathers on the collar and underparts, and buff edges on the wing coverts.
I have compiled a number of clips from various field trips showing the variation in plumage and the wide variety of environments that this species inhabits.