Plethodon cinereus, commonly known as the eastern red-backed salamander, is a small, terrestrial salamander found primarily in the eastern United States and parts of Canada. It typically measures 3 to 7 inches in length and is recognized by its slender body and distinctive coloration, which can range from gray to brown, often featuring a reddish or orange stripe along its back. This species prefers moist, forested habitats and is often found under rocks, logs, or leaf litter. Plethodon cinereus is a lungless salamander, meaning it absorbs oxygen through its skin, making it sensitive to environmental changes. It plays a vital role in its ecosystem by helping control insect populations and serving as prey for various predators.