Feather molt by Swainson’s hawks (Buteo swainsoni) on the austral grounds in Argentina
BECHARD, M. J. & C. S. WEIDENSAUL. 2005. Feather molt by Swainson’s hawks (Buteo swainsoni) on the austral grounds in Argentina. Ornitología Neotropical 16: 267–270. Link descarga: » PDF