Like many fragile island ecosystems, the Seychelles had loss of biodiversity during early human history. This included the disappearance of most of the giant tortoises from the granitic islands. There was also the extinction of species such as the chestnut flanked white eye, the Seychelles Parakeet, the Seychelles Black Terrapin and the saltwater crocodile. However, extinctions were far fewer than on islands such as Mauritius or Hawaii. This was partly due to a shorter period of human occupation being only since 1770. The Seychelles today is known for success stories in protecting its flora and fauna. The rare Seychelles Black Parrot, the national bird of the country, is now protected.