Icones avivm omnivm
Icones avivm omnivm is a 1560 bird book by the Swiss naturalist Conrad Gessner, printed at Zurich by Christoph Froschauer for scholars and naturalists. Its pictures are small woodcut profiles of single birds on plain grounds, with fine parallel hatching for plumage and clear outlines that a designer could use as simple, precise line studies of avian form.
