translate English to French: The morphological differences between juvenile and adult males have been described and the plumage characteristics have been successfully used in the field to age male Surf Scoters.
Les diffÃ©rences morphologiques entre les mÃ¢les juvÃ©niles et adultes ont Ã©tÃ© dÃ©crites, et les caractÃ©ristiques du plumage ont Ã©tÃ© utilisÃ©es de maniÃ¨re rÃ©ussie sur le terrain afin de dÃ©terminer l'Ã¢ge de Macreuses Ã front blanc mÃ¢les.