In 1944 Lady Park Wood (45 hectares of woodland in Gloucestershire and Monmouthshire, UK) was set aside indefinitely by the Forestry Commission so that ecologists could study how woodland develops naturally. Since then, in a unique long-term study, individual trees and shrubs have been recorded at intervals, accumulating a detailed record of more than 20,000 individual beech, sessile oak, ash, wych elm, small-leaved lime, large-leaved lime, birch, hazel, yew and other species. In the seven...