This Ibis in flight was taken along the ocean shore. Which meant there was a good chance the bird wasn’t full of mud. And yes, he was (mostly) clean.
Enlarge the above and you will see some ‘stuff’ on his bill. These birds live everywhere on the southern coast so half the time they are knee deep in swamp mud.
When in large flocks Ibis can fly slow, but for the most part the prefer full speed ahead.
I think this bird was slowing down when I spotted him, which explains how I caught 3 images in focus.