Three rare giant otter pups have begun swimming lessons at the UK's Chester Zoo. Led by mum Bonita and dad Manu, the rare pups were picked up by the scruff of their necks and popped straight in at the ‘deep end’. The triplets have been tucked away in their den for the first few weeks of their lives. Now, at 15 weeks old, the youngsters have been introduced to life in the water.