Despite these threats, no species are known to have become extinct since 1500. Two species, the New Caledonian rail and the New Caledonian lorikeet have not been seen for over a hundred years and are considered to be critically endangered if not actually extinct. A similar fate was thought to have befallen the New Caledonian owlet-nightjar, but a recent survey found them in remote areas. The New Caledonian crested gecko was thought to be extinct until it was rediscovered in 1994. Native grasses are being outcompeted by robust, introduced competitors, such as "Melinis minutiflora".