Lepidopterology

thumb|Euthalia aconthea (baron butterfly) caterpillar found in India thumb|Caterpillar of Papilio machaon thumb|upright|A monarch butterfly (Danaus plexippus) caterpillar feeding on an unopened seed pod of [[swamp milkweed]]

In animal dormancy, diapause is the delay in development in response to regular and recurring periods of adverse environmental conditions. It is a physiological state with very specific initiating and inhibiting conditions. The mechanism is a means of surviving predictable, unfavorable environmental conditions, such as temperature extremes, drought, or reduced food availability. Diapause is observed in all the life stages of arthropods, especially insects.

chromosomal system that determines the sex of offspring in birds, some fish, some insects and crustaceans, and some reptiles

thumb|A Lepidoptera specimen drawer in a museum insect collecting|collection in Poland thumb|Another Lepidoptera specimen drawer in a museum collection in Poland

online resource for names of butterflies and moths

migration of butterflies or moths

Biological system in certain moths

covering of an insect's wing

Citizen science project

facet of Lepidoptera

thumb|Danaus chrysippus showing hair-pencil at the end of the abdomen Hair-pencils and coremata are pheromone signaling structures present in lepidopteran males. Males use hair-pencils in courtship behaviors with females. The pheromones they excrete serve as both aphrodisiacs and tranquilizers to females as well as repellents to conspecific males. Hair-pencil glands are stored inside the male until courtship begins, at which point they are forced out of the body by sclerotized levers present on the abdomen. Coremata (the singular form being corema) are very similar structures. Their exact defi