Pheromones can be dispersed through the tibia segment of the leg, scales on the wings or from the abdomin. The Webworm caterpillars go into communal diapause. Moths are capable of migration but they do so over much smaller distances. Moths are active at different times of the night depending on species. Giant Silkworm Moths have a 1 year life cycle.
Wing veins are useful for species identification - kinda like finger prints.
The Clearwing family of moths resemble other flying insects like hornets, wasps and even Hummingbirds. Moths can produce as many as 10 broods per year. Feeding caterpillars can be in such large and concentrated numbers that you can actually hear them eat. Pheromones released by females can be detected by the males from as much as 8 kilometers away.