The nineteen species of native reptiles include the flowerpot snake, found only on Efate. The Fiji banded iguana ("Brachylophus fasciatus") was introduced as a feral animal in the 1960s. There are eleven species of bats (three unique to Vanuatu) and sixty-one species of land and water birds. While the small Polynesian rat is thought to be indigenous, the large species arrived with Europeans, as did domesticated hogs, dogs, and cattle. The ant species of some of the islands of Vanuatu were catalogued by E. O. Wilson.