https://www.sciencedaily.com/releases/2020/12/201221173124.htm
Fecal samples are an effective, non-invasive tool for monitoring gray whale reproduction, stress and other physiological responses.
Original Title: Hormone metabolites found in feces give researchers new insight into whale stress
Full Text of the Original Article: https://www.sciencedaily.com/releases/2020/12/201221173124.htm