Though this caterpillar is green and brown, the ratio of green to brown depends on the individual caterpillar. Some are mostly green with just hints of brown on the back, others look yellow on bottom and scorched on top. One area that is common among them all is the swollen second segment, which has brown a triangle on it, even it is faint.
This skinny larva stretches itself straight, and then bends its middle body upward to inch its way forward on a branch. Its coloring, narrow body, and small size make it easy for birds and other predators to mistake it for a growing twig. This species uses a variety of deciduous trees as a food host.
The map above showcases (in blue) the states and territories of North America where the Bent-line Gray Moth Caterpillar 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.*NOTE: States/Territories shown above are a general indicator of areas inhabited by the Bent-line Gray Moth Caterpillar. Insects generally go where they please, typically driven by diet, environmental changes, and / or mating habits.