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  • The world’s rarest skeleton rides again… on four legs

    By Jack Ashby, on 28 July 2015

    Using cutting-edge technology, the world’s rarest skeleton – a South African extinct zebra called a quagga – has regained its missing hind limb.

    The quagga's missing fourth leg has been replicated through 3D printing.

    The quagga’s missing fourth leg has been replicated through 3D printing.

    After a brilliant year of fundraising and conservation work, we are nearing the end of a major project to restore 39 of our largest and most significant skeletons to their former glory. The main focus of the project, named Bone Idols: Protecting our Iconic Skeletons, has been our quagga – which is one of only seven quagga skeletons to survive globally. The Guardian gave the project a particularly positve write-up (read the comments if you want to see some of the more unexpected outcomes of media relations. *blushes*).

    The last living quagga died in 1883, having been hunted to extinction by farmers and skin-collectors. The Grant Museum specimen is the only one on display in the UK but the skeleton was incomplete – the right shoulder blade and one of its legs has long been missing, probably since World War II.

    Recreating the leg of an extinct animal

    CT scanning the quagga leg (C) Nigel Larkin

    CT scanning the quagga leg (C) Nigel Larkin

    CT scanning the quagga leg (C) Nigel Larkin

     

    Working with conservator Nigel Larkin, the Royal Veterinary College (RVC) and the Bartlett Manufacturing and Design Exchange (B-made) at the UCL Bartlett School of Architecture, the nineteenth century skeleton has been rebuilt using twenty-first century science. The remaining right hind leg was scanned in a CT machine at RVC, a precise mirror-image of the resulting data was then created, perfectly replicating the missing left leg on the screen.

    The block fo bones arranged on screen to be printed (C) UCL B-made

    The block fo bones arranged on screen to be printed (C) UCL B-made

    This computer image was then modelled in solid nylon using a 3D-printer at B-made, to recreate the bones of a long extinct subspecies. Nigel Larkin then articulated the printed bones to make the historic skeleton complete once more.

    The same was true of the right shoulder blade, which is also missing (and now restored in nylon).

    Try balancing on three legs for 100 years

    The reproduction of the missing leg was the final step in a major undertaking to restore this invaluable specimen. As part of the Bone Idols project, the quagga skeleton was completely disassembled and cleaned of over 100 years of ingrained grime (the Museum is one of the oldest in the country and used to be lit by oil lamps). Its breast bones had been oozing black fatty deposits, which have now been removed. You can read about all the work it took to repair this skeleton on an older post.

    The skeleton was first mounted onto an iron frame in 1911, with five other skeletons at a cost of just £14. The neck was on upside down and the legs didn’t fit into their sockets. Since then the spine had sagged under its own weight. The project has rebuilt the quagga in an anatomically correct position on a skeleton-friendly frame.

    Because of its age, the quagga was in a pretty poor state, particularly for such an irreplaceable object. Through our Bone Idols project, we have worked with Nigel Larkin, a specialist bone conservator to restore the skeleton to ensure its long-term survival in the Museum. It will now be enjoyed by visitors, students and researchers for decades to come. The new leg also makes the whole skeleton more stable.

    The 3D printed quagga Bones (C) UCL B-made

    The 3D printed quagga Bones (C) UCL B-made

    International zebra of mystery

    There are many parts to the quagga skeleton’s story (much of which was coverered by this (different) Guardian piece). Its significance was only confirmed in 1972 when the Grant Museum’s two “zebra” skeletons were closely studied. This one was verified as an extinct quagga, while the other was downgraded to donkey. Throughout the Museum’s history these two specimens seem to have been confused a number of times. Newly uncovered archives suggest the quagga arrived in 1911, thirty years after the species became extinct.

    Where its leg went is another mystery, and the archive has letters from previous curators to other museums trying to track it down. The quagga now stands on four feet again, even if one of them was built by computers.

    To date the Museum has raised over £20,000 to fund the Bone Idols project. 31 of the 39 specimens have so far been conserved, including the Museum’s largest skeleton – the (hornless) Indian one-horned rhino skeleton, the skull of a giant deer and endangered chimpanzee skeletons.

    Thanks so much to all of those who have supported the project so far, and Nigel Larkin for conserving our large and complicated specimens and arranging the scanning, to Renate Weller and Laura Porro from RVC and Richard Beckett and Martyn Carter at B-made.

    Jack Ashby is Manager of the Grant Museum of Zoology

     

    One Response to “The world’s rarest skeleton rides again… on four legs”

    • 1
      Your best chance of seeing a mole | gonatureconnect wrote on 30 December 2015:

      […] collection not only includes a jar of moles, but also the ‘Quagga’, a horse-like species extinct since 1883, its zebra-striped front end and brown back end originated […]

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