Coyote Peterson gets creeped out and pinched by the mandibles of a Hellgrammite.
Hellgrammites are active at night, they ambush prey in the middle of riffles which supply plenty of oxygen and stir up prey. They are generalist predators; dissections have revealed that they primarily eat aquatic immatures of mayflies, caddisflies, stoneflies, and chironomid midges. Although the larvae spend most of their lives under rocks below water, locals along Virginia and Pennsylvania rivers have reported emergences, known as “hellgrammite crawlings,” during thunderstorms.
The Hellgrammite larvae live up to five years, but the adults (Dobsonfly) only live about a week, and are not known to eat anything in the wild. However, in captivity they have been reported to drink sweet solution.
Dobsonfly may be attracted by mercaptan, the additive in natural gas and propane to give an indication of a gas leak. The Dobsonfly may behave as an animal sentinel (a provider of advance warning to humans) in the presence of natural gas or propane.
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