Caterpillars feed on the leaves of alder and birch trees. They fold up a leaf and use their silk to form a retreat for themselves. They have been heard making soft audible clicks or taps when provoked. They are green, brown, or even purple at various stages. The 4 or 5 segments near the head have a pair of bumps on them, each with a single black hair extending from it. The ventral side (belly) may be a whitish-yellow and the tip of the abdomen tends to curve upward. Females can produce up to two broods each year.
The Arched Hooktip is a nocturnal moth though adults are attracted to lights at night. Look for them in forests in elevated areas and ones near coastal areas, especially in the Pacific Northwest and Northeast.