The original print of <a href="https://en.wikipedia.org/wiki/White%27s_tree_frog" class="extiw" title="en:White's tree frog">en:White's tree frog</a>, from <a href="https://en.wikipedia.org/wiki/John_White_(surgeon)" class="extiw" title="en:John White (surgeon)">John White's</a> <i>A Journal of a Voyage to New South Wales</i>. The specimen sent to the illustrator was blue because of the preservative.
Published 1789;
<a rel="nofollow" class="external text" href="http://gutenberg.net.au/ebooks03/0301531h/white-33.jpg">Project Gutenberg Australia</a>. Originally uploaded at <a class="external text" href="https://en.wikipedia.org">en.wikipedia</a>; description page is/was <a class="external text" href="https://en.wikipedia.org/w/index.php?title=Image%3ABlue_frog.jpg">here</a>.