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The Mackenzie Delta is a transition zone between ecosystems - from the boreal forest to the ever-frozen tundra.

A remote and spectacular haven for marine life in the eastern Pacific, the Socorro Islands are a tiny volcanic archipelago and are considered a must for undersea explorers.

Liz joins a team of scientists in search of an elusive sunfish and helps with the tagging and tracking of hammerhead sharks.

The nearly endless darkness and bone-chilling cold takes remarkable endurance for the people and animals of Alaska.

Heading towards the rains, it seems the young cubs may have a chance of surviving this perilous season.

Two yearlings that bonded after suffering traumatic losses are released, and Kim is inundated with hungry, orphaned moose calves.

When a worldwide pandemic cripples the rehab and Hope is down to a skeleton crew, wildlife emergencies keep coming in.

Devon Island is the largest uninhabited island in the world. It's so remote and forbidding that when scientists wanted to simulate living conditions on Mars, they chose Devon.

When a turkey vulture gets trapped under a seal carcass, a photographer snaps into action to save its life.

Ringed by one of the world's richest coral reefs, Cocos Island is a holy grail for divers.

When a Category 2 hurricane slams the rehab centre, Hope and her team struggle to protect their patients in the middle of the storm.

Liz Bonnin joins a team of biologists atop a volcano studying the endangered Galapagos pink iguana, then descends a kilometre into the ocean abyss in search of a new species hiding in the dark.

As Hope scrambles to get ready for her busiest day of the year, the government comes to seize the bear cub that she's worked so hard to save.

When a tiny fawn gets hit by a car, Dr. Jessica must splint its broken leg or it may never return to the wild.

Hummingbirds fly home from the tropics, and the people of Alaska take advantage of the endless summer daylight.

When a tiny piece of trash ruins a racoon's life, Dr. Jessica cuts it free. But Hope has to face tough decisions about its future.

The prides have overlapping territories, which means the action and events in one lion family unavoidably end up affecting the other.

When two harp seals are rescued, Hope's team struggles to teach them the natural behaviour they need to survive in the wild.

The shelter releases four of the most dominant yearlings. A wild bear threatens to invade the bear cub pens.

When a great horned owl arrives covered in oil, Dr. Sherri must put it through a difficult procedure to save its life.

The Arctic, locked in darkness for nearly seven months, springs to life once the sun rises above the horizon.

When an orphaned black bear cub needs help, Hope puts everything on the line to save it.

Behind-the-scenes stories delve into scientific research on animal colours and reveal the challenges of making the series, including the grueling endurance of lying motionless on a mudflat for hours.

When a Mountie saves a beaver, Hope helps the most Canadian wildlife rescue ever reach a happy ending.

Black bear cubs and fluffy baby otters mark the beginning of spring.

In Zambia's South Luangwa National Park, a young lion cub gets in trouble when he wanders away from the pride, while his cousins must face their unhappy new stepdad.

Two cubs become deathly ill from a parasite that has killed many bears, and the shelter gets the bears ready for hibernation.

On Australia's Great Barrier Reef, the blue-striped blenny changes its colours to deceive and launch an attack. The Bengal tiger uses its orange stripes to hide from its colour-blind prey.