Sex and age, but not blood parasite infection nor habitat, affect the composition of the uropygial gland secretions in European blackbirds

1. Díez-Fernández, A.
2. Martínez-de la Puente, J.
3. Martín, J.
4. Gangoso, L.
5. López, P.
6. Soriguer, R.
7. Figuerola, J.