Licence: Public Domain Mark
Credit: A raven (Corvus corax). Coloured engraving by Whimper. Wellcome Collection. Source: Wellcome Collection.
![no text alternative](https://iiif.wellcomecollection.org/image/V0022226EL/full/800%2C/0/default.jpg)
Licence: Public Domain Mark
Credit: A raven (Corvus corax). Coloured engraving by Whimper. Wellcome Collection. Source: Wellcome Collection.