It's Christmas at Chester Zoo. The UK's first ever surviving sun bear cub is born, and there's a yuletide ceasefire in the turf war between the otters and the babirusas.

Tortoises Burt and Terrance, who've been best mates for 70 years, compete for the affections of breeding female Smooth Sides. Pregnant okapi K'Tusha is due to give birth. Plus: vultures and elephants.

Red panda Nima's new mate, Koda, chases her up a tree. Baby meerkat Junior is struggling to get enough food. And a shy penguin isn't socialising with his colony.

Bush dog Mana is pregnant. There's a power struggle on chimp island. Otter Wallace is struck down by a mystery illness. And is romance in the air for wattled cranes Wilma and Ivan?

Young meerkats Beagle and Huskie become parents for the first time. And can painted dog Ville look after his seven adolescent pups on his own while the vets check up on their mum?

Young tapir Solo is moving to a new zoo. Pregnant rhino Asha goes into labour at night. Mantis Minnie is looking for a sexual partner, but female mantises have a bad habit of eating their partners.

Chimp Zee Zee gives birth to a daughter. Elderly chameleon Mr Parsons has a date. And Gaston the banteng bull has made three females in his herd pregnant

The keepers think that pregnant elephant Thi is three months overdue. Rampant giraffe Meru relentlessly chases the females in his herd. Plus: anteaters and clownfish.