 This allowed the evolution of a number of flightless birds and large reptile species.The arrival of humans saw the introduction of invasive alien species, the rapid destruction of habitat and the loss of much of the endemic flora and fauna.Less than 2% of the native forest now remains, concentrated in the Black River Gorges National Park in the south-west, the Bambous Mountain Range in the south-east, and the Moka-Port Louis Ranges in the north-west.