 Six species of butterfly are known to occur on Christmas Island.These are the Christmas swallowtail ("Papilio memnon"), striped albatross ("Appias olferna"), Christmas emperor ("Polyura andrewsi"), king cerulean ("Jamides bochus"), lesser grass-blue ("Zizina otis"), and Papuan grass-yellow ("Eurema blanda").Insect species include the yellow crazy ant ("Anoplolepis gracilipes"), introduced to the island and since subjected to attempts to destroy the supercolonies that emerged with aerial spraying of the insecticide Fipronil.