Even at the start of the Middle Ages the English landscape had been shaped by human occupation over many centuries. Much woodland was new, the result of fields being reclaimed by brush after the collapse of the Roman Empire. Human intervention had established wood pastures, an ancient system for managing woods and animals, and coppicing, a more intensive approach to managing woodlands. Other agricultural lands included arable fields and pastorage, while in some parts of the country, such as the South-West, waste moorland remained testament to earlier over-farming in the Bronze Age. England's environment continued to be shaped throughout the period, through the building of dykes to drain marshes, tree clearance and the large-scale extraction of peat. Managed parks for hunting game, including deer and boars, were built as status symbols by the nobility from the 12th century onwards, but earlier versions of parks, such as hays, may have originated as early as the 7th century.