Analysis of stable isotopes in feathers of Red-backed Shrikes (Lanius collurio): no evidence for different wintering habitats of males and females

Abstract

We investigated the stable isotope signatures (δ15N and δ13C) of greater feather covers of male and female Red-backed Shrikes (Lanius collurio) of a southern German population. Male and female birds did not differ in their isotope signatures, thus revealing similar winter grounds for both sexes.