Wonderful, Just Wonderful: Terrifying New World's Largest Flying Aquatic Insect Found In China

From geekology, This is the giant dobsonfly, the current record holder for largest flying aquatic insect. They can measure almost 8.5-inches across. For reference, that is 8-inches entirely too large for my liking.
Large enough to cover the face of a human adult, this scary-looking insect is also known among entomologists as an indicator of water quality, says the museum.

The giant dobsonfly makes its home in bodies of clean water and is highly sensitive to any changes in the water's pH as well as the presence of trace elements of pollutants. If the water is slightly contaminated, the giant dobsonfly will move on to seek cleaner waters.

Did you read that? They only like the very freshest water and will leave if they detect even the slightest pollution. You know what that means, don't you? "You're going to go take a dump upriver?" Haha, I am going to go take ALL the dumps upriver.