Common Raven (Corvus corax) - General information on the Common Raven. animaldiversity.ummz.umich.edu/accounts/corvus/c._corax.html
Common Raven (Corvus corax) - General information about the natural history of ravens. www.shades-of-night.com/aviary/ravendoc.html
Common Raven (Corvus corax) - General biology, habitat use, ecology, and the story of extinction and recolonization in and around Hesse, Germany. www.foto-natur.de/kolkrabe/english
