Our insect of the week for April 14, 2025 is the luna moth, Actias luna [LEPIDOPTERA: Saturniidae]. This is one of the larger moths in North America. Adults have been observed in central Illinois as early as late April (which is why we are discussing them now). As a defensive mechanism, caterpillars often emit clicks (and can regurgitate their gut contents). The long tails on wings of adults are thought to confuse echolocation used by bats (one of their main predators). Sadly, a parasitoid fly deliberately introduced to control the gypsy moth (now called spongy moth) seems to be having a significant negative impact on this species and many other native moths. Another cautionary tale about the dangers of improperly researched biological control.

Fun fact – this was the first North American saturniid to be discussed in insect literature in 1700. The species name luna refers to the Roman moon goddess. Another fun fact – the luna moth appeared on a USPS stamp in June, 1987. The specimen in the photograph was collected by our member, Frank Hitchell in Peoria County.