Audubon's Warbler, also known as the Yellow-rumped Warbler, is a small bird species commonly found in North America. This bird gets its name from the famous American ornithologist, John James Audubon, who first described it in his book "Birds of America." Despite its name, this bird is not always completely yellow, but varies in color depending on breeding season and location. Some possible synonyms for Audubon's Warbler include Butter Butt, Yellow Crowned Warbler, or Myrtle Warbler. These names can be helpful for birdwatchers or researchers seeking to differentiate between different subspecies or varieties of Audubon's Warbler found across the United States.