The Fir Tussock Moth is also known by the name(s) of: Live Oak Tussock Moth.
The Fir Tussock Moth is typically 0.5 inches to 0.9 inches (15mm to 25mm) in size and has the following descriptors / identifiers: four clumps, four bumps, hairy, spiky, stinging caterpillar, flying, rounded wings, brown, tan, white, gray.
Territorial Area Map (Visual Reference Guide)
The map below showcases (in blue) the states and territories of North America where the Fir Tussock Moth may be found (but is not limited to). This sort of data can be useful in seeing concentrations of a particular species over the continent as well as revealing possible migratory patterns over a species' given lifespan. Some species are naturally confined by environment, weather, mating habits, food resources and the like while others see widespread expansion across most, or all, of North America.