Native trees in Toronto are trees that are naturally growing in Toronto and were not later introduced by humans. The area that presently comprise Toronto is a part of the Carolinian forest, although agricultural and urban developments destroyed significant portions of that life zone. In addition, many of Toronto's native trees have been displaced by non-native plants and trees introduced by settlers from Europe and Asia from the 18th century to the present. Most of the native trees are found in the Toronto ravine system, parks, and along the Toronto waterway system.