title: Comparative psychology and ethology: a saga of twins reared apart.
mesh_terms: D000818:Animals; D001522:Behavior, Animal; D005075:Biological Evolution; D001717:Birds; D005010:Ethology / Q000266:history*; D049670:History, 17th Century; D049671:History, 18th Century; D049672:History, 19th Century; D049673:History, 20th Century; D006801:Humans; D011587:Psychology, Comparative / Q000266:history*; D013045:Species Specificity; D014481:United States