With their piercing gaze and their hooting echoing through the countryside in the moonlight, owls have fascinated people since time immemorial. As protected species that can therefore only be studied in the wild, they remain poorly understood by the scientific community... With the exception of passionate ornithologist Alexandre Roulin, who has focused his research on this nocturnal bird of prey for over twenty years, using 250 nesting boxes installed in barns and tobacco sheds throughout the Broye and Orbe valleys.