Very young <a href="https://en.wikipedia.org/wiki/Monarch_butterfly" class="extiw" title="en:Monarch butterfly">Monarch butterfly</a> caterpillar on <a href="https://en.wikipedia.org/wiki/milkweed" class="extiw" title="en:milkweed">milkweed</a>. Despite the filename, that is not an egg on the leaf; I had thought it was, but upon double-checking it, I was mistaken. It seems to be a very small spider or mite.
<dl><dt>Location</dt>
<dd>Milwaukee, Wisconsin, USA</dd>
<dt>Technical information</dt>
<dd>Taken with Canon Powershot A75, no zoom, <span style="font-style:italic;font-family:Georgia,serif">f/</span>4.5, 1/500s exposure, auto ISO. Cropped with the GIMP but otherwise unaltered.</dd></dl>
<a href="//commons.wikimedia.org/wiki/User:JohnOwens" title="User:JohnOwens">John Owens</a> <a href="//commons.wikimedia.org/wiki/User_talk:JohnOwens" title="User talk:JohnOwens">(talk)</a>
CC BY 2.5
<span class="int-own-work" lang="en">Own work</span>