ENTS Concentrator Markael Luterra ('07) created a guide for the Cowling Arboretum as his capstone project. This well-researched and interdisciplinary guide describes the history and major habitats of the Arb. The history section begins with bedrock formation 500 million years ago and proceeds through glaciation, presettlement times, Carleton purchase, and changing land use goals. The habitats section describes the ecology of the prairie, oak savanna, upland and floodplain forests, pine plantations, and wetlands, and also provides descriptions of the most common plants and animals in each habitat. In addition, 49 signs placed along Arb trails mark points of interest and are accompanied by descriptions in the guide. The guide is available online for download at the arboretum website.