Ranked two-state models of parental status (Ψpair; according to Julian day and sampling year) and its detection probability (pair; according to sampling conditions) at pair level (n = 2331 adult songbirds).

Julian day is the number of days since 1 January of the corresponding year.AIC of the highest-ranking model: 1419.85.†Intercept parameters for Ψ and p were included in all models.‡Sampling conditions included time of day and sampling weather conditions as covariates of parental status detection probability.