Egret on L. has blue streak on head and red legs
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I'm pretty sure these are all great white egrets (apart from the ibis). The one on the left is just in its full breeding colours. I once saw one in the UK nearly as bright as this, but without the red legs. Although this is a cosmopolitan species the colours do vary from region to region.
I agree with Bob. It is in breeding colours, green lores & the gape line extends behind the eye. The Ibis is Black-headed (Threskiornis melocephalus)
Lat/Lng: 9.5822, 76.1613