I was looking at some of the photos I took this summer, and ran across some photos I took in June of a red admiral. The pictures did not seem too remarkable at the time, but I had not noticed the hitchhiker at the time.
Pseudoscorpions are known to hitch rides on insects but I have never seen one on a butterfly. I did not see this one, either, until I saw it on the photo.
I wish I had noticed it when I took the photo.