From various internet sources: The Ou can only be found above 3,000 feet elevation within predominately native forest habitats above the mosquito range where they are safe from insect-borne diseases. It is critically endangered, close to extinction, and not likely to be seen.
Marian Berger's paintings of O'u can be found on my website at: 1990 Lithographs.
Image is copyrighted by Frederick Frohawk and Wellfleet Press.