Helen Skelton and Nick Baker return to Yorkshire Wildlife Park, near Doncaster, to celebrate the work that British zoos perform in the service of worldwide conservation. In the first edition, they drop in on three one-month-old endangered tiger cubs, Yorkshire Vet star Peter Wright befriends a tame tapir. JB Gill assists as a pygmy hippo is given a much-needed dental procedure and helps determine the sex of a baby sloth, while attempts are made to encourage two rare Chinese alligators to breed.