Tracking the movement of insects in their natural habitat is essential for
understanding their basic biology, demography, and ethology. A wide variety
of markers have been used to assess insect population dynamics, dispersal,
territoriality, feeding behavior, trophic-level interactions, and other ec
ological interactions. The ideal marker should persist: without inhibiting
the insect's "normal" biology. Furthermore, the marker should be environmen
tally safe, cost-effective, and easy to use. In this article, we review the
current state of knowledge regarding insect marking, document the advantag
es and limitations of each marking technique, and discuss advances made in
marking insects over the past decade.