24/09/2026
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Today, on World Rhino Day, we are sharing how a greater one-horned rhino named Hugo has had his sight restored with help from an ophthalmologist from our Hospital for Small Animals.
Professor Claudia Hartley travelled to Whipsnade Zoo to perform cataract surgery on 23-year-old Hugo’s left eye.
While the surgical principles are similar to cataract surgery in humans and other animals, anaesthetising and operating on a 2.2-tonne rhino presents significant logistical and clinical challenges.
This is the second such procedure Professor Hartley has carried out on Hugo, having performed cataract surgery on his right eye four years previously. His sight issues had become apparent then, when zoo keepers noticed changes in his behaviour, including bumping into structures in his paddock. Four years on, and the cataract in Hugo’s left eye had worsened, compromising his eyesight once more.
Thanks to expert care and planning, the latest surgery was a success. After recovering from anaesthesia, Hugo received two weeks of eye drops to support healing. We are delighted to report that Hugo has made an excellent recovery and is able to see clearly again.
Amy Allan, from our hospital’s surgical theatre team, who assisted with Hugo’s surgery, said: “I feel incredibly honoured to be asked to be involved in this case. It was a once-in-a-lifetime opportunity and an experience I will never forget. To be able to say I got to assist with cataract surgery on a rhino is simply amazing.”
Karla Berry, a veterinary nurse at Whipsnade Zoo, said: "It was a pleasure to welcome Professor Hartley back to Whipsnade Zoo, and through collaborating with her and specialists on her team, we have been able to give Hugo the best care possible.”
photo courtesy of ZSL
Whipsnade Zoo