Zero testosterone

shutterstock_148848815During days preceding rut, males tolerate each other and live around without retaliation. Tolerance dries out as daylight shortens, leading to a drastic increase of testosterone secretion. Within a few days, the hormone produces radical changes in male behaviour. We then observe zero tolerance for any rival or intruder, as well as frequent and sudden clashes between males.AppleMark

To learn more about canadian cervids and their habits, visit Panache : caribou and other cervids at Musée du Fjord.

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