Grumpy elephant Thi is expecting a baby. The chimps battle for dominance. Red panda Nima gives her partner Jung the cold shoulder. And the meerkats prove they're not as loveable as they first seem.

Inseparable penguins Rud and Spike have been a couple for 15 years. But Rud's arthritic hip could be affecting his quality of life. The tigers move house, and a tarantula risks his life to reproduce.

Chester Zoo's giraffe family have a new arrival. Frog keeper Pip creates a love den to try to get endangered frogs in the mood to lay eggs. And the aardvarks wreak havoc by night.

A potentially deadly virus hits the elephant house. Will Chester's female zebras be interested in new stallion Mac? Plus: the bizarre world of the naked mole rat.

Humboldt Penguin chicks are introduced to the main pool. Two Sunda Gharial Crocodiles arrive from France, but refuse to eat. Boris the chimpanzee takes a wild Moorhen chick hostage and keepers try to figure out why two Bornean River turtles aren't breeding.

Black Rhino female, Kitani, is introduced to a new mate, Magadi, and a baby Sumatran Orangutan is born.