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.

Hornbills survived a fire that swept through their home, but it may have derailed their plans for chicks. Meerkat matriarch Huskie seems to have lost her breeding instincts. Sun bear Milli has her paws full bringing up her daughter Kyra.

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.

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.