This is a controversial subspecies possibly distinct from the Aldabra giant tortoise. Originally, several different subspecies of giant tortoise inhabited the Seychelles. The domed Mauritius giant tortoise ("Cylindraspis triserrata") is an extinct species of giant tortoise. The Aldabra giant tortoise has an unusually long history of organized conservation. Esmeralda is an Aldabra giant tortoise living in the Galapagos Islands. The giant tortoise has also proliferated, despite the inhospitable nature of the landscape. During the late Pleistocene, the island was inhabited by a now-extinct giant tortoise, "Chelonoidis sombrerensis".