Stable Isotope Analysis Reveals Biases in the Performance of a Morphological Method to Distinguish the Migratory Behaviour of European Robins Erithacus Rubecula

1. Hera, I.D.L.
2. Fandos, G.
3. Fernández-López, J.
4. Onrubia, A.
5. Pérez-Rodríguez, A.
6. Pérez-Tris, J.
7. Tellería, J.L.