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Ciconia episcopus
Also known as Bishop Stork or White-necked Stork, it is a large wading bird in the stork family Ciconiidae. (http://en.wikipedia.org/wiki/Woolly-neck...)
It is a widespread tropical species which breeds in in Asia, from India to Indonesia, and also in Africa. It is a resident breeder in wetlands with trees.
They were a small group of 7 or 8 birds.
Thank you, KaleeVidanapathirana. I have edited my spotting according to your suggestion.