National Geographic WILD Saturday

Teleshopping.

Teleshopping.

Lions put their lives on the line to fight each other and protect their prides, and tigers battle against each other to lay claim to precious hunting territory

Highlights from the series, in which the vets visit zoos, farms and even their old university to help a student

A sloth bear is ready to find a mate. Plus, a look behind the scenes as keepers wrangle a herd of rare onagers into the barn for their annual check-ups

An agitated cow has stopped eating, which is not good news for the calf dependent on her. At the clinic, D Emily examines a dog who arrives in a stretcher

Dr Oakley tackles the castration of a huge muskox, but a rival male poses a threat to the procedure. The challenge of herding wild horses is eased by technology

Time is of the essence as Dr Oakley races to diagnose a cat with a bladder issue, and a cattle farm needs a hand to test out a new system for some rowdy bison

A team of marine ecologists travels to the southern Line Islands to examine the area's ecosystem, home to 10 times more sharks than any other reef in the world

Thord and Andrzej fall prey to the Norwegian winter and, in a shocking twist of events, they end up in need of rescue

Thord and Bjoern face a roadside stand-off with the police when they're forced to stop a rescue in its tracks

Part one of a two-part special in which Simon Keys and Siouxsie Gillett showcase some of the series' toughest snakes

Part two of a two-part special. More highlights from the series, including deadly black mambas in wardrobes and spitting cobras in factories

The vets get up close and personal with venomous snakes, help a dog whose face droops, and send a diabetic canine on the road to recovery

A spectacular aerial journey across Bulgaria reveals Varna's magnificent cathedral restoration, a UFO-like monument and the ruins of an ancient sanctuary

A birds-eye view of the Canaries and Balearic Islands of Spain showcases astonishing marine mammals, unique vineyards and a stunning gothic Cathedral

Animals that live along coastlines, including reddish egrets, Atlantic bottlenose dolphins, sea turtles, penguins, whales and great white sharks

Simon has his hands full with a lightning-fast mamba and an unidentified snake terrorises a school, before Siouxsie handles the deadliest of the lot

The volunteer fire department carries out an emergency drill, and Matt Carlson and Kaylee Burk take their daughter on a scouting mission to find key resources

With winter looming, the residents of Port Protection must rely on each other to prepare for the harsh months ahead