NON-INVASIVE HORMONE ANALYSIS
Determination of steroid hormones in whale blow: It is possible
Determination of testosterone in saliva and blow of bottlenose dolphins (Tursiops truncatus) using liquid chromatography-mass spectrometry.
Urinary cortisol sampling: A non-invasive technique for examining cortisol concentrations in the Weddell seal, Leptonychotes weddellii
Measuring Stress in Antarctic Seals
Faecal testosterone concentrations and the acoustic behavior of two captive male Australian fur seals
Photo of manned wolf urinating on tree by Jonathan Wilkins