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Captain & Striker: Tig's moose hunt is thwarted by a pack of wolves, Marvin races to repair his home, Jody endures heavy snow and John makes the most of a typhoon. U. (S2, ep 5)

River Alert: Jo Roger and Ole Henrik struggle to rescue a trailer load of salt that threatens to pollute Norway's biggest salmon river. Any slip-up could cause an environmental disaster. 7+

A Reptile Dysfunction!: Staff rush to help a malnourished lemur. Plus, Yoda the chameleon comes in with an unusual problem and a beloved mouse gets an eye lift. (S4, ep 12)

Danger Down Under: Six-feet long, the Murray cod is said to eat birds, snakes, possums and even its own kind. Zeb goes in search of these powerful, yet threatened, behemoths. (S2, ep 13)

Game of Bones: While a Labrador and her housemate need urgent help, some fair pigs get some much needed TLC and there's trouble at a nearby dairy. (S11, ep 7) 7+

Like Mother, Like Daughter: Dr Oakley performs a checkup on two scrappy lynx, and Sierra takes charge on clinic day. 7+ (S11, ep 7)

Alligator Gar: Zeb goes in search of one of North America's most misunderstood monster fish, the alligator gar: a bizarre 10-foot creature with a mouthful of razor-sharp teeth. (S2, ep 2)

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Teleshopping.

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Cat Out of Hell: An unusual line-up of patients test Yukon vet Dr Michelle Oakley's mettle, including a Himalayan yak that shocks everyone when he wakes up during surgery. 7+ (S3, ep 8)

Kodiak Kings: Survivalist Les Stroud gets up close and personal with the biggest brown bears of them all as they race to ready themselves for their long hibernation. (5 of 5) 7+

Spiders & Scorpions: A look at the wonderful world of arachnids - possibly the best equipped hunters on the planet, armed with amazing weapons and inexplicable powers. (S1, ep 7)

Bone Crushers: Asian tigers and Arctic bears take centre stage in these bone-shattering clashes. There are no rules in these extreme animal battles. (S5, ep 8) 7+

Faux Paws: From a harrowing farrowing, to broken bones, the vets pull off miracles. Meanwhile, the Pol family welcomes a new mare to the herd. (S12, ep 4)

No Moosetakes: Dr Oakley operates on an unusual mass and investigates a musk ox with a hair loss problem. 7+ (S11, ep 6)

With over 900 species enduring all habitats from Mexico to the high north, North America's dazzling diverse birdlife varies from the delicate and graceful to the brutish and beastly. 7+

Off The Hook: The team face a tense hour when a big biter battles with the line. With just three days and three tags left, can they lure a great white onto their boat? 7+ (S1, ep 5)

Storm of Snakes: Simon and Siouxsie risk it all to save a black mamba in a storm. Plus, a cobra launches a sneaky attack and a huge spitter squares up to a tiny dog. (S5, ep 2)

Fire and Rain: As storms close runways, a man has an apparent heart attack on an incoming flight. Can the plane land? Later, a fire drill turns into a real emergency. (S1, ep 4) 7+

Chicken of the Sea: Join Dr Oakley as she treats a chunky chicken, a calf that was attacked by a bear and a rescued kitten with worms. (S8, ep 19)

Chimp off the Old Block: Zoo keepers prepare for a chimp birth, vets investigate a bear's mystery illness and a dangerous antelope is darted. (S1, ep 1) 7+

The Misfit Comes of Age: Rejected by his mother and bullied by his brothers, this oddball lion has had a rough ride. But his troubles are far from over as more trials lie ahead. (S3, ep 3)

The Leopard Who Changed her Spots: Meet young leopardess a mummy's girl Chipadzuas. This pampered princess should have left the family a year ago but she just won't fly the nest. (S3, ep 4)

Burning Daylight: When the sun doesn't set, Alaska natives forgo sleep to make the most of the daylight. U. (S2, ep 6)

Road Closed!: Bjørn and Thord rescue a truck that got stuck just 200 metres from its destination. Jo tries to save a harvester, but then its impatient drivers endanger his crew. 7+