Keywords: Darwin Variation Fig39.jpg en Figure 39 - Skull viewed laterally reduced to two-thirds of the natural size A Wild Duck B Hook-billed Duck from Charles Darwin's book Variation of Animals and Plants Under Domestication published in 1868 Scanned from book by uploader - 300dpi Creator Charles Darwin 1868-01 PD-old-100 Variation of Animals and Plants under Domestication |