The prehistoric-looking eastern dobsonfly (Corydalus cornutus) looks more intimidating than it is—both in their larval form and as adults. They can be found in and around swift flowing, unpolluted streams and their presence is a good indicator of stream health. These insects are large—as adults, they reach up to four inches long with inch-long curved mandibles. They are mottled gray-brown with white spots, veined wings, and long antennae. Despite having such long jaws, adult dobsonflies do not eat and will not bite unless provoked. Males have a less painful bite than females, using their mandibles to compete with other males—females use them for self-defense. Dobsonfly larvae are known as hellgrammites and can grow up to three inches long with large pincers on their heads. Eastern dobsonflies spend the bulk of their lives as hellgrammites, living in streams where they hunt and eat soft-bodied invertebrates for three to four years until they are ready to pupate. Adult dobsonflies live for less than two weeks, spending that time mating and laying eggs. Although most active at night, adult dobsonflies are occasionally seen during the day at Glenstone resting on the Pavilions and the surrounding greenery.

–Carly Davis