The Cowling Arboretum, associated with Carleton College, features various ecosystems, including water and wetlands, oak savanna, and upland forest. The arboretum is also home to diverse wildlife, such as otters and frogs, and includes areas like Kettle Hole Marsh and Carp and Lyman Lakes. The arboretum's ecosystems and wildlife are being noted and surveyed, with certain species and areas being highlighted.