Stedman, J M Heritable variation in circulating glucocorticoids and endocrine flexibility in a free-living songbird. [electronic resource] - Journal of evolutionary biology Sep 2017 - 1724-1735 p. digital Publication Type: Journal Article ISSN: 1420-9101 Standard No.: 10.1111/jeb.13135 doi Subjects--Topical Terms: Adaptation, PhysiologicalAnimalsCorticosteroneGlucocorticoids--metabolismSongbirdsStress, PhysiologicalSwallows