Tropical Lepidoptera often exhibit dramatic changes in abundance - a population boom is called an irruption. Consider a 2014 study, OBSERVATIONS ON AN IRRUPTION EVENT OF THE MOTH ACHAEA CATOCALOIDES AT KAKAMEGA FOREST, KENYA. In 2012, A. catocaloides (Noctuidae: Erebidae) abundance reached an estimated 6.8 moths/m2 in a 12,000 ha. area. Predation on moths was observed for 14 bird species, monkeys, and squirrels. If the moth species was rarely observed in normal years (the authors do not state a typical density), it would be incredibly conspicuous in an outbreak year.
There is some evidence for irruption events of white witches. If one were present for such a phenomenon, and if it occurred where moths were emerging, the chances for locating larval stages would increase in proportion to the size of the population boom.
There is some evidence for irruption events of white witches. If one were present for such a phenomenon, and if it occurred where moths were emerging, the chances for locating larval stages would increase in proportion to the size of the population boom.