I saw a large green caterpillar in the yard yesterday and have no Idea what kind it may be. I live in eastern PA The photo is one I found online, as the chicken ate it before I could take a pic. It was very similar tho'. The spot on it was Yellow and Black at the end, (unless he was going in Reverse, I do not know. LOL) the color was Bright green. it had a smooth body. I do not recall the horn. And it was LARGE! approx. 4" long and 1/2 " diameter. ANY IDEA WHAT IT WAS?