Finally, the plantations and their related agricultural development radically altered Ireland's ecology and physical appearance. In 1600, most of Ireland was heavily wooded, apart from the bogs. Most of the population lived in small townlands, many migrating seasonally to fresh pastures for their cattle. By 1700, Ireland's native woodland had been decimated; it was intensively exploited and sold for profit by the new settlers for commercial ventures such as shipbuilding, as much of the English forests had been destroyed and the navy was becoming a great power. Several native species, such as the wolf, were hunted to extinction during this period. Most of the settler population was urbanized, living in permanent towns or villages. Some of the Irish people continued their traditional practices and culture under the shadow of heavy control and punishments. By the end of the plantation period, almost all of Ireland had become integrated into a market economy. But many of the poorer classes had no access to money, still paying rent (for land that was once owned by Irish people) in kind or in service. The plantations also introduced a new measurement system to Ireland called the Irish measure or plantation measure which had some residual use even into the 20th century.