Aardvark Koos gets romantic with his sister in this night-time special. Can underdog seahorse Seabiscuit grow the vital appendage he needs to attract a mate? Plus: bats and mouse deer.

Sun bears Toni and Millie have relationship problems. Critically endangered eastern black rhino Zuri gives birth to baby Ike. Otter Annie has three new pups. And camel Shan-shan is unwell.

Golden poison frog Pablo has lost interest in his partner Maria, so bad boy El Loco is brought in to shake things up. In the chimpanzee habitat there's a power struggle for the role of dominant female. And baby porcupine Marion faces off the meerkat mob.

Sloth Tina has been giving her partner Rico a hard time, but the keepers have a plan to bring them closer together. And three-legged chameleon Tripod goes speed-dating.

The keepers are busy making gifts for the animals but there's chaos when the chimps seek out their parcels. Will dwarf mongooses Cooper and Mini have new babies before Christmas? Plus rhinos and ants.

Chester's male lemurs' peaceful life is turned upside down by a female arrival. Can Permata, a young Javan green magpie, impress older female Metina and help boost their endangered population?

The chimps have been brandishing a large stick; keeper Niall tries to get it back. Male onager Holmes chases every female in sight - including the camel next door - during mating season.

Pygmy marmoset Audrey has to carry her babies everywhere. Andean bear cub Madidi embarks on an adventure into a neighbouring paddock. Plus: young elephants and baby hyraxes.

Red panda Jung is losing weight and no one knows why. Mandrill Ludo gets over-friendly with his dad's girlfriend when his dad's at the vet's. Plus: tigers, and penguins.

Four rare and mysterious tenrecs arrive at the zoo. Endangered eastern black rhino Kitani is due to give birth. And jewel wasp Ripley searches for a cockroach to turn into a zombie egg incubator.