1) almost perfect forewing camouflage on tree bark;
2) startling take-off flight, often revealing brilliant, previously hidden hindwing colouration;
3) response to bait, adding another dimension to collection/observation;
4) diapause in egg stage on tree bark;
5) larval camouflage and habits;
6) interesting common names;
7) remarkable resemblance species to species and variability of forewing patterns within a species;
8) fall flight time for many species.