: These voracious eaters can skeletonize leaves, sometimes stripping entire trees during outbreak years. Common hosts include Douglas-firs, oaks, and maples .
: Those fuzzy hairs aren't just for show; they are urticating hairs (barbed bristles) that can break off into the skin, causing a burning, itchy rash known as dermatitis.
The larvae are the most recognizable stage, often featuring four prominent tufts of hair on their backs and long "hair pencils" extending from the front and rear.
The (family Lymantriidae) is best known for its larval stage—strikingly hairy caterpillars decorated with dense, brush-like tufts called "tussocks" . While they are essential members of their ecosystems, they are often recognized for the skin irritation their hairs can cause and the significant defoliation their outbreaks can bring to forests. The Caterpillar: "Danger Fluff"