Poaching has left this rhino the last male of his kind

The world's most pampered rhino is having his mudpack applied by hand. Sudan the veteran northern white rhinoceros stands placidly and allows his personal assistant to rub dollops of wet clay into his hide, to moisturise his skin and keep insects away. 'He loves that,' says Zach, his 24-hour-a-day PA. Zach lives next door to the rhino enclosure, permanently on call in case His Lordship should require anything. And Sudan is very high maintenance – he used to have a man whose job was rubbing oil into his hooves.