EVER wondered what happens in the lives of Chester Zoo's inhabitants when no-one's looking?

Well you can find out in Channel Four's heartwarming documentary The Secret Life of the Zoo, which returns for a fourth series on November 15.

The show will take you inside the world of the attraction's 15,000 animals, following their rites of passage, observing family dynamics within the animal groups, and seeing how relationships, old age, parenting, conflict, life and death play out in their lives.

The new series features more animals than ever before – from elephants to jewel wasps, and the mysterious tenrecs to the critically endangered Javan green magpie.

Chester's keepers also share the secrets of looking after some of the world’s most endangered species, and reveal all they do to keep their animals happy and healthy.

In the first episode, eastern black rhino Kitani is due to give birth, and help swell the ranks of this incredibly rare species... As you can imagine it's an exciting but nervy time for keepers.

Also among the show's stars is Jewel wasp Ripley, who wants to find the perfect cockroach to help give birth to her offspring. She plans to lay her egg on a living cockroach, paralyzing him with venom and effectively turning him into a zombie.

The zoo has four rare new arrivals – lowland-streaked tenrecs, mysterious mammals from Madagascar. With so little known about them the keepers are trying everything they can to help them breed.

And red river hog Mali has given birth to twins, but could tearaway dad Confetti be a danger to his own babies?

The Secret Life of The Zoo starts on Wednesday November 15 at 8pm