To me, it looks like an immature American wood stork, The legs and bill are a bit "heavy" for an ibis.
https://www.allaboutbirds.org/guide/Wood_Stork/id
It seems like a closer match would be a juvenile American White Ibis, though I haven't found many with the exact color pattern as yours.
http://www.oiseaux-birds.com/card-american-white-ibis.html
https://www.allaboutbirds.org/guide/White_Ibis/id
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