“…Concentrations of CORT in feathers have been shown to vary in response to life history events (Bortolotti et al, 2008;Crossin et al, 2013), sibling competition (Yosef et al, 2013), health status (Harriman et al, 2014;Meitern et al, 2013;Mougeot et al, 2010;Sild et al, 2014), overwinter survival (Koren et al, 2012), food limitation , reproductive investment (Fairhurst et al, 2012a;Kouwenberg et al, 2013), and with environmental conditions (Carrete et al, 2013;Fairhurst et al, 2011;Fairhurst et al, 2012b;Legagneux et al, 2013). Feather CORT concentrations have also been shown to be related to problem solving and learning (Bókony et al, 2014), and to feather pigmentation (Fairhurst et al, 2014;Kennedy et al, 2013;Lendvai et al, 2013;Martínez-Padilla et al, 2013). However, as far as we are aware there have been only a few studies that report feather CORT concentration in relation to pollutant exposure (Cruz-Martinez et al, 2015;Harms et al, 2010;Lattin et al, 2014).…”