Green-headed Tanager (IMAGE) University of Tennessee at Knoxville Caption Green-headed Tanager (Tangara seledon) in Itatiaia National Park, Brazil. Tanagers comprise the most diverse extant avian family, with numerous species, including T. seledon, endemic to the Atlantic Rainforest of South America. Credit Daniel Field. Usage Restrictions Please give proper credit. License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.