About 40 years ago I read a book that I think was then over 20 years old. It was set in the South of the USA. One character became very rich, and bought a piece of land because as a boy he had liked the bird life -flamingos I think. When he visited the land he had bought he found all the flamingos were gone. This was because two local men had shot all the flamingos to sell feathers to clear a debt they owed him! What is the book?