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Plegadis falcinellus
I think these may be white-faced ibis. This is another related spotting in the same area: http://www.projectnoah.org/spottings/793...
Seen at Mandalay National Wildlife Refuge
Thanks for the ID help and pointing out that subtle difference! I was very surprised to see so many in one pond. Previously I've only seen 1 or 2 at a time.
I would say Glossy Ibis rather than White-faced because White-faced ibis tend to have a bit of pink on the front of the face at the base of the bill, and glossy ibis do not. Otherwise, they are extremely similar. Great pictures though!