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.

Yorkshire Wildlife Park welcomes the arrival of a baby aardvark, and at Knowsley Safari Park, a male and female Amur tiger are introduced for the first time. However, the encounter comes with a high risk, as if things go badly, it could lead to death to either animal. Elsewhere, comedian Susan Calman spends the day assisting the staff at Blair Drummond Safari Park in Sterling.