Attributes / relations provided by
♦ 1del Hoyo, J., Elliott, A., Sargatal, J., Christie, D.A. & de Juana, E. (eds.).
Handbook of the Birds of the World Alive. Lynx Edicions, Barcelona.
♦ 2Avian and mammalian predators of shrews in Europe: regional differences, between-year and seasonal variation, and mortality due to predation, Erkki Korpimäki & Kai Norrdahl, Ann. Zool. Fennici 26:389-400. 1989