Giant Swallowtail egg. Watched female ovipositing egg, took this photo minutes later.
<a rel="nofollow" class="external text" href="https://www.flickr.com/people/39139121@N00">Anne Toal</a> from US
CC BY 2.0
<a rel="nofollow" class="external text" href="https://www.flickr.com/photos/39139121@N00/1233201675/">Giant Swallowtail Day 1 Egg laid 1:25 PM 25 August 2007</a>