American Bittern in camouflage stance in the Myaka River State Park, Florida, as photographed by Sabine Rodens (2006), from Wikipedia Commons.
Frederick C. Gould, "Camouflage" in The Sydney Stock and Station Journal [quoted from The Westminster Gazette] on Friday, April 11, 1919, p. 2—
The Bittern took Camouflage lessons,
For he wanted to look like a stick,
And a Futurist artist in khaki
Taught him the vanishing trick;
He painted his feathers with markings,
And drilled him to stand like a log,
Till he looked not a bit like a Bittern
But just like a bit of the Bog.