1. Assessing costs of carrying geolocators using feather corticosterone in two species of aerial insectivore by Graham D. Fairhurst, Lisha L. Berzins, David W. Bradley, Andrew J. Laughlin, Andrea Romano, Maria Romano, Chiara Scandolara, Roberto Ambrosini, Russell D. Dawson, Peter O. Dunn, Keith A. Hobson, Felix Liechti, Tracy A. Marchant, D. Ryan Norris, Diego Rubolini, Nicola Saino, Caz M. Taylor, Linda A. Whittingham, and Robert G. Clark R. Soc. Open Sci. Volume 2(5):150004 May 6, 2015 ©2015 by Royal Society

2. Levels of corticosterone in feathers (CORTf) from tree swallows instrumented with a geolocator compared to non-instrumented (control) birds. Graham D. Fairhurst et al. R. Soc. open sci. 2015;2:150004 ©2015 by Royal Society

3. Levels of corticosterone in feathers (CORTf) from barn swallows instrumented with a geolocator compared to controls. Graham D. Fairhurst et al. R. Soc. open sci. 2015;2:150004 ©2015 by Royal Society

4. Within-individual change in levels of corticosterone from feathers (CORTf) of tree swallows in two consecutive years. Graham D. Fairhurst et al. R. Soc. open sci. 2015;2:150004 ©2015 by Royal Society