As the documentary series following life at Chester Zoo returns, on Chimpanzee Island the younger males test the pecking order. And there's a fish out of water at the aquarium. Deer couple Serena and Odin welcome their second doe.

Adolescent babirusa Tolo has a hoof problem. Rock hyraxes Daissie and her partner Nungu are expecting their eighth litter. At the reptile house, the Bermuda skinks have a ferocious approach to mating as Poptart meets Sharkface.

Keepers are curious when Margery the Malayan tapir is suddenly eating for two; a deadly virus is suspected of being the cause behind a female hyacinth macaw's untimely death, her partner James Bond must undergo total isolation.

A couple of giant otters welcome four pups and must learn the difficulties of parenthood; a Red River hog struggles to survive alongside her two sisters; zookeepers try to help a sickly Batagur turtle that has them concerned.

The zookeepers run into obstacles as they try to transport an Asiatic lion king Iblis and his kin to a new habitat; a fight breaks out in the vampire crab exhibit; an Andean bear suffers from a broken heart and a toothache.

Zookeepers work through trouble as they try to pair Chester's newest bongo couple; a trio of silver-eared mesia chicks must find new shelter when a major storm destroys their nest; a Malagasy giant rat must undergo surgery.

A violent fight breaks out when a new chimpanzee attempts to overtake the current matriarch; the Zookeepers excitedly await confirmation that two Chinese croc lizards are expecting; two pink pigeons struggle to raise their young.

A sickly orangutan named Sarkiei mus be quarantined away from her prized son; when a mother giraffe named Dagmar becomes too thin, the zookeepers consider separating her from her calf; a male giant otter pup refuses to eat.