This is a Bald-Faced Hornets nest I found in a tree on my back lawn. The expression as mad as a hornet is an accurate one. Bald-faced hornets are certainly the physically strongest stinging insect. It is the only one able to sting directly through protective clothing or shoot venom into your eyes if it hits hard enough against the protective netting covering your face. Hornets nests are entirely exterior; trees, shrubs, under decks, and high in the eaves. They construct a football or upside down teardrop-shaped nest from gray paper. Hornets, as do wasps and yellow jackets, actually make this paper themselves by chewing on tiny slivers of wood. The young are hatched and food is stored in the nests center or core of hexagonal (or six-sided) cells.