I've been hunting with my son since last summer for monarch caterpillars. We have been searching every patch of milkweed we could find. A lone milkweed popped up next to our home (in a rock bed) so I left it alone, just in case. Well, yesterday I happened to check it and to my surprise I found a few of these little buggers on it.
2. Less than 3/16" long!
I went back later and found one more larger one, a little over 1/2" long. Now to keep them alive until they form chrysalis'.
Thanks for looking,