caterpillar of a swallowtail butterfly

I came home from work today to find this little guy crawling on the side of our house! Any idea what it is?  Thanks Dave

This is a caterpillar of a swallowtail butterfly (Lepidoptera: Paplionidae) in the genus Papilio; see https://tinyurl.com/y7c8pns8 for an example. These caterpillars often change from green to brown as they get ready to pupate.  Ed Saugstad, retired entomologist; Sinks Grove, WV.