We've seen stick bugs in our bug books and in nature centers but never on one of nature walks and yesterday we were lucky enough to find one. Really cool to watch and really hard to see. I just happened to see a twig walking and thought it was strange. It was about 4 inches long. So cool!
Image is from funkman.org/animal/insect/stickinsect.html and you can read more about them here. They really are hard to find because they blend in so well.