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The couple were visiting the Centre for Wildlife Rehabilitation and Conservation near the Kaziranga National Park, north-eastern India. The centre provides emergency care for wild animals that have been injured, displaced, or orphaned.
Vivek Menon, chief executive of the Wildlife Trust of India, said: "They were absolutely thrilled and loved being with the animals. The duke said if he could, he would have spent the whole day there."
William and Kate later experienced tremors from a 7.0-magnitude earthquake which had struck Myanmar. The quake happened 500 miles from where the royals were staying, but its tremors spread across southern Asia.