"Tree Lobsters" Thought Extinct From Human Activity Are Not Actually Extinct After All

"Tree Lobsters" Thought Extinct From Human Activity Are Not Actually Extinct After All

When explorers first reached Lord Howe Island off Australia's east coast they found it home to a truly remarkable creature, sometimes dubbed the "tree lobster". Also known as Lord Howe Island stick insects (Dryococelus australis), the bugs in question were subsequently wiped out. It seemed to be just another case in the sad catalog of human-induced extinction, until a similar creature was discovered on a nearby island. Doubts remained whether these were actually the same species as those that inhabited Lord Howe. New research, however, has definitively put that question to rest.

Islands support some very odd life forms, as the absence of competitors opens up evolutionary niches – particularly when the island is small and isolated. D. australis was a particularly good example, growing to 15 centimeters (6 inches) long and weighing 25 grams (0.9 ounces). Consequently, they were collected in abundance by naturalists. Unfortunately, by the 1920s museum collections were all that was left, as shipwrecked rats quickly changed the island's ecology and led to the insect being declared extinct.

Then in 1964, a similar-looking creature was discovered on Ball's Pyramid, an island as astonishing for its shape as its ecology. The first specimens were freshly dead but in 2001, a tiny population was found clinging precariously to the one spot on the bare island they can survive, most living in a single shrub. A breeding program at Melbourne Zoo has bolstered their numbers. Hopes rose that, if the Ball's Pyramid insects represented the lost species, they might be reintroduced to Lord Howe, after removing the rats of course.

Unfortunately, the living insects didn't look quite like the dead ones in museums, raising doubts about how closely related they might be.

Now the species is saved, the stick insects of Lord Howe Island and Ball's Pyramid can reach for the sky. Rohan Cleave/Zoos Victoria

Now the species is saved, the stick insects of Lord Howe Island and Ball's Pyramid can reach for the sky. Rohan Cleave/Zoos Victoria

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