but I am moving it to Limenitis

where I found the caterpillar is a two-foot sapling! But, there are also mature cottonwoods, poplars and a willow there. Also, swamp milkweed with several Monarchs flying about--or so I thought. I'll pay closer attention, maybe some are actually Viceroys. I haven't noticed any Red-Spotted Purples. I have a flower pot filled with parsley that some Black Swallowtail caterpillars are feeding on and, by what now seems an odd coincidence, a cottonwood popped up in the same pot. I almost pulled it yesterday, but decided to leave it alone. I've put the Viceroy/Red-Spotted Purple on it and it's happily munching away. I'll protect it and see what it becomes. Perhaps as it grows bigger it will become more obvious as to specie? Thanks for your help. I really appreciate it. I tried to identify it before submitting the image, but it didn't match up to anything in my field guide.