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

This study was funded by projects CGL2015-65055-P and PGC2018-095704-B-I00 from the Spanish Ministry of Science and Innovation and European Regional Development Fund (FEDER). ADF were supported by Severo-Ochoa grant from the Spanish Ministry of Economy and Competitiveness (SVP-2014-068571). LG was supported by a Marie Sklodowska-Curie Fellowship from the European Commission (grant number 747729, ‘EcoEvoClim’).