Colour variation in wild Norway rats captured in England, fig 57 opp. page 126 in Genetics and Eugenics by W. E. Castle, Harvard University Press, 1916
Licence: In copyright
Credit: Colour variation in wild Norway rats captured in England, fig 57 opp. page 126 in Genetics and Eugenics by W. E. Castle, Harvard University Press, 1916. Wellcome Collection. Source: Wellcome Collection.
