| Titre : | Basic II and Basic III plumages of Rough-legged Hawks |
| Auteurs : | W. S. Clark, Auteur ; H. M. Peter, Auteur |
| Type de document : | Article |
| Dans : | Journal of Field Ornithology (76(1) WIN 2005) |
| Article en page(s) : | 83-89 |
| Langues: | Anglais |
| Résumé : | Adult Rough-legged Hawks (Buteo lagopus) are depicted and described in bird guides and handbooks as sexually dimorphic in plumage. We describe for the first time a Basic II plumage for this species, determined by incomplete flight feather molt, in which both sexes have the characters of adult females, and Basic III plumages that are essentially adult by sex but show pale primary patches on the upper wings. |



