Documentary series following the staff and animals at Chester Zoo. Sumatran orangutan sisters Emma and Subis are, unusually, due to give birth at the same time, after male Puluh got them both pregnant. Two-horned chameleon Ruby arrived at Chester after being transported illegally by pet traders and seized at customs. Meerkats Beagle and Huskie have moved to the zoo as the new breeding pair, but their new housemates, the aardvarks, are making them anxious. The zoo's pair of vampire crabs, Janet and John, are not getting on.