Seasonal, sexual and developmental differences in hoopoe preen gland morphology and secretions. Evidence for a role of bacteria. Martín-Vivaldi Martínez, Manuel Lorenzo Ruiz-Rodríguez, Magdalena Soler, Juan José Peralta Sánchez, Juan Manuel Méndez, María Valdivia Martínez, Dolores Eva Martín Platero, Antonio Manuel Martínez Bueno, Manuel 2024-02-03T19:56:05Z 2024-02-03T19:56:05Z 2009 journal article https://hdl.handle.net/10481/88063 https://doi.org/10.1111/j.1600-048X.2009.04393.x eng http://creativecommons.org/licenses/by-nc-nd/3.0/ open access Creative Commons Attribution-NonCommercial-NoDerivs 3.0 License