The Bald Eagle showed up on The Great Seal of the United States in 1782. The Eagle since ancient times was considered to be a sign of strength. It is becoming extinct. The DoDo Bird IS extinct but it far better represents the America of today, 2017, all things considered. Doesn't it? The DoDo Bird is a clumsy flightless extinct bird. When you call a human a DoDo Bird the dictionary says the following:
"A dull-witted, slow-reacting person with old-fashioned conservative or outmoded ideas. A thing that is outmoded or obsolete". We are no longer Eagles but DoDo Birds. Whether we wish to admit it or not.