The Lord Howe Island stick insect (Dryococelus australis) was thought to be extinct by 1930, only to be rediscovered in 2001 (this phenomenon is known as the "Lazarus effect"). It is extinct in its largest habitat, Lord Howe Island, and has been called "the rarest insect in the world", as the rediscovered population consisted of fewer than 30 individuals living on the small islet of Ball's Pyramid.