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[Tom Hiddleston] The night.

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A shadowy world that hides more than half the animals on our planet.

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Until now, cameras only offered a glimpse into their lives.

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But with next-generation technology,

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we can see the night as clear as day.

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With cameras a hundred times more sensitive than the human eye...

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we can now capture the beauty of night...

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in color.

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Alien landscapes.

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Strange creatures brought to life by the darkness.

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Unseen behaviors.

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Now we can follow the lives of animals

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in Earth's last true wilderness.

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The night.

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Evening is falling in the world's greatest tropical wetland.

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Brazil's Pantanal.

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[birds chirping]

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A stronghold for South America's most secretive big cat...

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the jaguar.

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And enjoying the last warmth of the day is a male

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-[purrs] -known as Juru.

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At six years old and weighing over 100 kilos...

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[purrs]

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...he's amongst the largest,

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most powerful big cats in the Americas.

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This prime stretch of river has been his territory for two years.

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[bird chirping]

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But tonight Juru's reign hangs in the balance.

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In a recent fight with a rival male, he badly injured his paw.

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It's left him weak and hungry.

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The coming days and nights will test him more than ever before.

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He'll need to summon the strength to defend his river.

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But this evening, his first priority is finding something to eat.

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To hunt, Juru must have the element of surprise.

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But in daylight,

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his injured paw makes sneaking up on prey almost impossible.

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[otters chirping]

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A family of giant otters has spotted him.

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[roars]

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[chirps]

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It seems there's little chance for a meal in daylight.

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But the jaguars here are largely nocturnal.

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They're twice as active at night.

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Juru knows the coming darkness may bring him success.

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[birds squawking]

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As the tropical sun sets...

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the river transforms.

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Until now, what jaguars got up to at night on these rivers...

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has been a mystery.

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[birds squawking]

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But with cameras that can film only by moonlight...

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we can now see their nighttime world...

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in color.

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[birds chirping]

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[squawking]

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Allowing us an intimate view into Juru's life.

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And giving us a window into the night on his river.

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After hours resting his injury, his first steps appear excruciating.

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But he's got no choice.

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He must try to hunt.

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His night vision, six times more sensitive than our own,

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picks out a group of capybara,

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giant rodents that live on the river.

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Jaguars are ambush predators.

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Juru must get within meters of his prey to stand a chance.

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But now at night...

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he has darkness on his side.

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The capybara can't see him.

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But our cameras can.

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Despite his injury...

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he's closed the distance.

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[barks]

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[barks]

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[barking]

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With the capybara in the water, Juru needs a different approach...

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and reveals something truly remarkable.

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At night, jaguars here are aquatic hunters.

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Relieved from the pain by the water,

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Juru now uses the river as a stalking highway.

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Until we followed Juru,

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no one knew the extent to which jaguars stalked rivers like this at night.

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[barks]

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He's managed to creep up on the capybara.

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But they're skittish.

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And alert.

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[barks]

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[barks]

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[barks]

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-He's been rumbled. -[barking]

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[barking]

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-[barks] -[barks]

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It's just not Juru's night.

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But he needs to eat soon to have the strength to continue to rule.

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In the savanna that borders Juru's wetlands...

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the night reveals one of South America's most mesmerizing light displays.

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These beacons are produced by click beetle larvae

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emerging from their burrows in termite mounds.

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For a few weeks a year...

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each mound, some up to three meters tall...

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lights up the night sky.

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The night also draws out winged termites

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that fly between the mounds to breed in their millions.

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But for the termites, the lights are lethal.

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They're attracted to them like moths to a flame.

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But it's a trap.

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The glowing grubs are termite hunters.

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They'll feed on the corpses in the darkness of their burrows...

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in one of nature's most sinister,

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but magical midnight feasts.

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[thunder rumbling]

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Back on the river, two nights have passed.

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Juru still hasn't eaten.

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He's weaker than ever...

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and now faces a new problem.

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[low roar]

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In the darkness...

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[low roar]

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...he hears a distant roar that could be a rival male.

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[low roar continues]

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But night cameras show...

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it's something more enticing.

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[low roar continues]

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It's the mating call of a young female jaguar called Ague.

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She's calling to attract a partner

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and appears to be following the scent of Juru and other males

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that have passed along the beach.

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[low roar continues]

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She's only in heat for a matter of weeks.

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So hopes tonight her calls will be answered.

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She spots something emerging from the dark...

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but it's definitely not what she was hoping for.

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A Brazilian tapir...

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one of South America's rarest nocturnal creatures.

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Ague doesn't know whether to attack or retreat.

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[bird cawing]

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Luckily for the tapir,

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Ague's still got her mind on finding a mate.

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[cawing]

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[low roar]

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And all her calling at last attracts attention.

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[low roar]

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But this powerful male isn't Juru.

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He's an intruder...

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[low growl]

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...a threat to Juru.

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But just what Ague has been looking for.

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Big cat courtship is usually a raucous affair.

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But seeing into their nighttime world shows it can be far more gentle.

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The young couple sit together as if on a first date.

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Seemingly happy just to be close to one another.

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[bird cawing]

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And tonight they're not the only ones on the river

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for whom love is in the air.

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[roars]

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Choosing the right partner takes a bit of time.

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[chirps]

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[caws]

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[roars]

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Following Ague through the night

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reveals a surprisingly tender side to jaguar courtship

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filmed for the very first time.

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[roars]

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Ague has got her man.

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But for Juru, control of the river is slipping away.

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Two evenings later, he remains alone...

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and still hungry.

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He hasn't eaten for a week

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but must do soon to keep hold of this prime territory.

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In the two years this has been his river,

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it's the hardest time Juru's ever faced.

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But he's not about to give up yet.

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His paw is healing.

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As dusk draws in, hunger drives him on.

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Now stronger, he can hunt the river...

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in a different way.

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He spots a capybara seeking shelter in the reeds.

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But he's not the only hunter here.

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A yacare caiman.

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Two meters long, and another top predator also on the prowl.

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Juru must move slowly to avoid raising the alarm.

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But tonight he's not after capybara.

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For a hungry jaguar,

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even other predators are on the menu.

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The most powerful jaws of all big cats finish the fight.

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A prize like this will be devoured in hours...

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but will sustain Juru for days.

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Juru is finally back on form.

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As another night descends,

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Juru is back patrolling his realm.

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Over the many moons he's ruled this river,

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this last has been his toughest.

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But against the odds,

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Juru is ready to face whatever new challenges may come his way.

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Only by seeing into his world at night

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have we been able to tell the full story of Brazil's jaguars

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in a way never possible before.

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To film jaguars in Brazil's Pantanal,

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the Earth at Night team had to take to the water

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using filming boats armed with specialized night cameras.

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The crew weren't searching for just any jaguar,

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but one cat in particular. Juru.

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[man] We're looking for Juru.

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We lost him into the forest,

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and we're thinking he may pop out onto one of these beaches

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that have been lit up by the moonlight now.

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[man 2] Really would like to find Juru. Feels like a needle in a haystack.

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I mean, to find a jaguar is fortunate around here.

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And to find a given jaguar that's our star, it's asking a lot.

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[Tom Hiddleston] The team's years of experience following and filming big cats

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was being put to the test.

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[Stevens] The guides know these cats really well.

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They've spent hours with them during the day.

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But no one's ever done this at night before.

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So it's, um, it's new for everybody.

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[Tom Hiddleston] Juru's territory stretches for up to 100 square kilometers.

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So just finding him at night was an achievement.

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It's 4:15 in the morning. We've been out here for 12 hours.

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And we found him.

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Right, he's just... popped his head out.

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Looking around, he's not that alert. He still looks quite sleepy.

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[Tom Hiddleston] Having found Juru,

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the crew now relied on the night cameras to see into his world.

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If I glance up and look at the riverbank, there's no way I can see the cat there.

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It's way too dark. These cameras are phenomenal.

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[Tom Hiddleston] With this new approach, the team could follow Juru

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and capture the otherwise secret moments of his nocturnal story.

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-[Moore] Look, in the water. -[man 2] A bit to the left.

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[man 1] The capybara is approaching the jaguar.

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[barks]

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It's amazing.

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[Tom Hiddleston] But it wasn't just Juru

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who would give the crew a surprising insight

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into what jaguars get up to under moonlight.

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There's another jaguar on the beach over there.

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It's straight-- It's straight ahead, like, 12 o'clock.

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The jaguar's coming towards us.

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[men speaking Portuguese]

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[Tom Hiddleston] The crew's encounter with Ague

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was about to reveal a softer side to this otherwise fearsome predator.

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-Oh, wow. -[man] Ah, look at that.

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[chuckles]

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-[Stevens] That's really nice. -[Moore sighs]

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[Tom Hiddleston] This behavior has never been seen, let alone filmed before.

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We are now following a courting couple into the night.

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[Moore] They're actually pretty tender with each other. It's interesting to see.

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Total lovebirds.

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I think the book on jaguar behavior is being--

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being written right here.

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[Tom Hiddleston] Being able to follow Juru and the other jaguars at night

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marks a whole new chapter in our understanding

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of these secretive big cats.