The Columbus Zoo has two white-faced ibises in its North American aviary. The birds were perhaps first-years in 2018. All About Birds says, "In good light, note the metallic green and bronze wings."
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May 7, 2018
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July 25, 2018 - They've got brown heads and necks with a little red.
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August 7, 2018 - Here's the whole bird. The red on the back is actually the inside leading edge of the wing.
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April 3, 2019 - The next spring, the red is gone. (This picture is of the golden plover at the back. I thought it might be interesting to have the two ibises out-of-focus in front. They're on the roof their winter home in the aviary.)
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May 15, 2019 - Six weeks later, the ibises' necks and breasts are red, and we see why they're called white-faced. (I don't know what the ceremony is. If it's related to mating, nothing will come of it because both are male.)
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July 1, 2019 - The colors are still strong after another six weeks.
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November 4, 2019 - Back to brown.
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June 11, 2020 - Looking fancy again.
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As far as I know, feathers don't change color, so there must be two molts per year: One to turn red, presumably for breeding season, and another to return to brown. Or maybe the red just fades.
