Illustration of a dodo and its gizzard stone, copied from an illustration in the journal of van Neck, which is now missing.
Carolius Clusius, after van Neck
1605
<a rel="nofollow" class="external free" href="http://docnum.u-strasbg.fr/cdm/ref/collection/coll13/id/28876">http://docnum.u-strasbg.fr/cdm/ref/collection/coll13/id/28876</a> (page 116)