The Great Animal Highways That Cross the Planet | Full Documentary

Across mountains, forests, oceans, deserts, and grasslands, millions of animals are constantly on the move.

They follow routes that can stretch for hundreds or even thousands of miles.

Some are visible from the ground.

Others are hidden beneath the ocean.

Some have existed for generations.

And some are so precisely followed that animals seem to know exactly where they are going.

These are Earth's great animal highways.

In The Great Animal Highways That Cross the Planet, we explore the extraordinary migration routes that connect ecosystems across the world and reveal how animals navigate an ever-changing planet.

From massive herds crossing African grasslands to birds traveling between continents, we follow the routes that animals use to find food, water, breeding grounds, and safer environments.

We explore the great migrations of:

• Wildebeest across the Serengeti • Caribou across the Arctic • Elephants across seasonal landscapes • Salmon returning to their birth rivers • Sea turtles crossing entire oceans • Whales traveling between feeding and breeding grounds • Birds crossing continents during seasonal migration

But these aren't simply journeys.

They are ecological systems.

An animal migration can transport nutrients across ecosystems, redistribute energy, spread seeds, connect distant habitats, and influence entire food webs.

We explore how animals navigate using remarkable biological systems.

Some follow landscapes.

Some respond to temperature and seasonal changes.

Some use Earth's magnetic field.

Others rely on sunlight, stars, smell, ocean currents, or memories passed through generations.

The farther we follow these routes, the more surprising they become.

A salmon can return to the river where it was born.

A sea turtle can cross an ocean and return to a particular coastline.

An ancient route that once stretched uninterrupted across a landscape can become fragmented by modern development.

Its survival depends on keeping those connections intact.

The remarkable truth is that Earth is covered with highways that humans rarely see.

There are paths through the grasslands.

Routes across mountains.

The Great Animal Highways That Cross the Planet.

A journey across the hidden routes that keep Earth's ecosystems connected.

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