in addition, plant distribution of dmz is also unique. it is home to a variety of species including endangered wild animals and plants, such as parasitic flowers, winged larks, and plum blossoms. these naturalized plants are mainly dandelion, swine grass, maple leaf swine and evening primrose. in particular, maple leaves and pig grasses originating in north america are threatened by indigenous plant ecosystems. these alien species were estimated to have been handed over to korea by the us army at the time of the korean war. thus, the dmz has a unique natural ecosystem that can not be seen elsewhere, and is a place of study that shows the process of changing natural ecosystems after the war.