Figure 1

Comparison of nest-wide relationship classes for German and Spanish samples.
Proportion of nests per region with only full-siblings (FS), one or more pairs of half-siblings (HS), one or more pairs of unrelated nestlings (U), or one or more pairs of “not full-siblings” (NFS) for cases where full-sibling relationships could be rejected but definitive differentiation between HS and U could not be made. There were no significant differences between populations for any of the relationship classes. NGermany = 95 NSpain = 50.