Nymph, Dryococelus australis was thought to be extinct, following the accidental introduction of rats to Lord Howe Island in 1918, but has since been discovered on a small volcanic outcrop called Ball’s Pyramid.
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Nick Carlile, seen here with the Lord Howe Island stick insect (also called a Tree Lobster), discovered the thought-to-be extinct phasmid in 2001 on Ball's Pyramid. The last sighting of this critter was in 1920 when a ship ran aground on Lord Howe Island and the rats found a favourite food to munch on -- the tree lobsters. This last population was found on a neighboring rock, with the entire world population living around one sole bush.
Lord Howe Island Stick Insect hatching at Melbourne Zoo. The Lord Howe Island Stick Insect, Dryococelus australis, was driven to the brink of extinction by Black Rats in the early twentieth century. However, in 2001 it was rediscovered on Balls Pyramid, a rat-free volcanic outcrop 23 km off the coast of Lord Howe Island, which is located off Australia's east coast.
it was that scientists assumed the stick insects would never be seen again. Then, however, a group of climbers stumbled upon the remains of a Dryococelus australis on Ball’s Pyramid. Moreover, this was some 44 years after the last known sighting of the insect, dead or alive.