When I find a caterpillar where it doesn't belong I try to return it to a tree that it eats from, but today i didn't have time to look it all up. So i picked a tree and hoped for the best. It turns out they eat from many, many different trees. Lets just hope I didn't pick the only one from our yard that it doesn't eat. Since we are heading into fall this little guy will make a cocoon that will sit all winter and hatch in May. He will be this super large moth. 5 1/2 inches big.