Lind, Henrik. “Different Ecology in Male and Female Wintering Snowy Owls Nyctea Scaandiaca L. In Sweden Due to Colour and Size Dimorphism”. Ornis Svecica 3, no. 3–4 (October 1, 1993): 147–158. Accessed April 26, 2024. https://journals.lub.lu.se/os/article/view/23039.