These data describe the levels of certain hormones in faeces and blood of adult urban European blackbirds (Turdus merula) and further conditions associated with the sampling. The samples were collected between March 2011 and May 2013 by Anja Russ, Terézia Lucenicová, Sarah Effertz, Rebecca Thier-Lange, Diana Höhlig, Simon Dietzel, Tobias Köhler, Alexandra Erbach, and Daniela Dunger. The analyses of hormone concentrations were conducted at the Institute of Physiological Chemistry, University of Leipzig, by Susanne Reitemeier, Anne Weissmann, and Jutta Gottschalk. These data have been collected with support of the research project „Birds in illuminated landscapes (BILL)“ funded by the German Federal Ministery of Education and Resarch (BMBF) under the grant: FKZ 033L038E Please note: as decimal marker commas are used. label description #date date of sampling #year year of sampling #time daytime of sampling (CET) #time_ratio time of sampling divided by length of daytime hours #10_mean_Temp running mean per decade of the daily mean temperature in °C #10_prec running sums per decade of daily precipitation in mm #sex sex of bird #lamp_density density of municipal street lighting at sampling location (kernel density with 50m search radius) #noise_KFZ noise at sample sites in db car traffic obtained from noise indices #noise_TRM noise at sample sites in db tramway traffic obtained from noise indices #testo testosterone concentration in faeces in ng/g faeces #oestro estrone sulphate concentration in faeces in ng/g faeces #CORT corticosterone concentration in blood sample in ng/ml #BirdID individual bird ID #body_condi index of body condition, calculated as residuals from an ordinary least-squares linear regression between body mass and tarsus length for males and females separately #difftime_capture elapsed time between capture and blood sampling in min