Many butterflies dependent on specific habitat structures and resources (specific caterpillar food plants and nectar resources). Thus, butterflies represent excellent model organisms to study changes in nature. In this working package we will record butterflies in the church forest and the surrounding habitats, along established line transects. Based on these data we will evaluate the value of church forests for typical forest butterfly species. This working package will be mainly supervised by Thomas Schmitt and Jan C. Habel.