Attributes / relations provided by
♦ ¹Tornberg, Risto, Pekka Helle, and Erkki Korpimaki. "Vulnerability of black grouse hens to goshawk predation: result of food supply or predation facilitation?" Oecologia 166.3 (2011): 577+. Academic OneFile. Web. 15 July 2014.
♦ ²HOSTS - a Database of the World's Lepidopteran Hostplants Gaden S. Robinson, Phillip R. Ackery, Ian J. Kitching, George W. Beccaloni AND Luis M. Hernández