The larvae feed on ash, oak and other woody species, but the adults do not feed.
This image is an example of a clearly marked individual with all the expected wavy lines and the white reniform spots on the forewings. This one is relatively easy to identify using standard field guides.
By comparison, this next individual is quite dark, which makes the white spots more distinct. You can still clearly see the wavy lines and the checkered edges of the forewings. Despite its differences, it's still relatively easy to identify this moth as C. undulosa.