Clouded salamanders (Aneides ferreus), despite being terrestrial and spending most of their lives on the forest floors, are also semi arboreal. Researchers James Swingle and Eric Forsman found that clouded salamanders were sharing nests with tree voles, high up in the tree canopy. The researchers hypothesized that this could be a beneficial relationship, where the salamanders eat the mites and other invertebrates in the vole nests, which can be problems for the tree voles in large quantities. The highest tree vole nest with a clouded salamander found was at 61 meters, or 200 feet.