Table 1.

Number of samples collected from primary captures (P) and recaptures (R) of mallards, by age (i.e., juvenile: <1 year, adult: >1 year) and sex from August until December 2010. From all individuals, cloacal and oropharyngeal swabs, sera samples and body mass measurements (n = 287) were collected

Age	Sex	Resident		Local migrant	Distant migrant
		Primary	Recapture
Juvenile	Male	6	3	26	25
	Female	6	1	8	9
Adult	Male	31	14	30	30
	Female	22	3	44	29
Total		65	21	108	93