Above, a fox standing on a mountain craig staring into a tree-top in pursuit of prey, below, the fox's tracks. Etching by J. E. Ridinger.

Licence: Public Domain Mark

Credit: Above, a fox standing on a mountain craig staring into a tree-top in pursuit of prey, below, the fox's tracks. Etching by J. E. Ridinger. Wellcome Collection. Source: Wellcome Collection.