Mesic sites that support dense, succulent understory vegetation for marten prey species are considered the best habitat. During the summer, martens may hunt for food in open meadows bordering dense forests if hiding cover is present . Martens will avoid areas that are so dense that herbaceous cover is suppressed. Dense understory, including slash or rotten logs and stumps, is necessary for denning and hiding. Open areas adjacent to these forests will be used for hunting only if they provide adequate hiding cover and food.
Martens prey on small mammals, particularly mice and voles.