737616.fig.003
Figure 3: Age-related distribution of Larus fuscus in winter range. Age structure of the gulls (as the relative frequency of the immatures (0 and 1 year-old) and adults (2 or more year-old)) at the North (above 49°), Central (between 49° and 30°), and South areas (bellow 30°). Numbers inside bars correspond to dead birds recovered in each class.