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How to Identify Brown Moths of Illinois

Illinois is home to over 1,800 species of moths, the largest of which is the brown-winged cecropia, with a wingspread of 5 to 6 inches. You can distinguish a moth from a butterfly by antennae and body size. Moths never have knobs on the ends of their antennae (butterflies always do) and their bodies are quite stout. They typically appear more earth-colored than butterflies, but if you get close you'll find that even the brown moths of Illinois are quite beautiful.

Things You'll Need

Camera or sketchbook
Notebook
Pen or pencil

Instructions

- 1
  Locate at least one field guide and familiarize yourself with the information on brown moths. Two good choices are the 12-page paperback "Illinois Butterflies &Moths: An Introduction to Familiar Species," by James Kavanagh and Raymond Leaung, and "The Moth Book," by William Jacob Holland.
- 2
  Learn where brown moths conceal themselves during the day, when they are likely to be at rest. For example, the Darling Underwing likes to hide in the crevices of bark, eaves and caves, and wild Silk Moths can be found on the sides of buildings.
- 3
  Photograph, sketch or take notes on the moths you find. Pay close attention to the forewing pattern, length and shape, the size, shape and color of any wing spots and the wing shape when the moth is at rest. Also note the month of year; some species are active for only a brief timespan.

Insects & Science