- 25 minutes ago
In the rivers of Alaska, a dramatic spectacle of wildlife migration unfolds: salmon embark on an upstream journey to spawn, only to face bears, eagles, and other predators lying in wait—all driven by the same instinct to reproduce.
这一集讲述了一条雌性粉红鲑从海洋游回故乡、全程长达2000英里的旅程。它凭借地球磁场、视觉和嗅觉，精准地找到了自己幼年时期离开的那条河流。它必须闯过一段长达30英里的险途，沿途遍布激流、漩涡和瀑布。在这场旨在繁衍后代的艰苦竞逐中，每千条鱼里仅有两条能幸存下来。
这一集讲述了一条雌性粉红鲑从海洋游回故乡、全程长达2000英里的旅程。它凭借地球磁场、视觉和嗅觉，精准地找到了自己幼年时期离开的那条河流。它必须闯过一段长达30英里的险途，沿途遍布激流、漩涡和瀑布。在这场旨在繁衍后代的艰苦竞逐中，每千条鱼里仅有两条能幸存下来。
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00:14Alaska's six-month-long winter is finally loosening its grip.
00:30To survive here, animals have got to race to the waking rivers far below.
00:50Last fall, this female brown bear climbed to the safety of a high mountain den and, for
01:02the first time, gave birth.
01:07Six months later, hungrier than ever, she is setting out on an epic journey with her two
01:24vulnerable cubs.
01:32In the distance, a more experienced mom is one step ahead.
01:46Her two older cubs have learned a quicker way down.
02:11This is no place to stick around.
02:22Each day, the spring melt dials up the danger.
02:53One hundred thousand tons of snow and ice.
02:58Charging at a hundred miles per hour will take no prisoners.
03:23One hundred thousand tons of snow and ice.
03:36The seasoned mom's wise decision-making has kept her cubs alive for two years.
03:51But the first time, mother, has a tough road ahead.
03:59Just one in two cubs are likely to make it through their first perilous year.
04:09To secure their future, she must make it down the mountain, timing her arrival to the river, with the
04:30greatest migration of them all.
04:57By late May, spring melt water.
05:01It opens the floodgates.
05:11For the one journey, on which all others depend.
05:30Alaska's animals.
05:36Some going in alone.
05:42Others traveling together must battle devastating odds.
05:52All racing down to the river to cross paths with the life-bringing salmon.
06:16As spring turns to summer in the North Pacific Ocean, a determined adventurer is setting out on a very important
06:28journey.
06:31A female pink salmon, on her way home.
06:41And she's not alone.
06:50Half a billion salmon.
07:05And she's not alone.
07:09And she's not alone.
07:10She's not alone.
07:15She's a very good night.
07:17And she's a wild fish.
07:30Arriving at the coast, where melt and seawater mix, they are funneled into this gloomy fjord.
07:51Salmon shark, the great white's smaller cousin.
08:06These ambush predators have traveled thousands of miles to join the race to feed.
08:27Only 5% of all pacific salmon survive the ocean phase of their journey.
08:37This mother-to-be is one of the lucky ones.
08:42But to lay her eggs in the same gravel beds where she was born, there's now a whole new set
08:52of obstacles to overcome.
08:57Over the coming months, salmon will race up almost every river along this pacific coast.
09:06Some on a 2,000-mile marathon.
09:11The equivalent of swimming from New York to Florida and back, uphill.
09:24Until she gets to the river below, the hungry brown bear mom still has mouths to feed.
09:36Halfway down from their mountain den, she's stepping in the paw prints of her ancestors.
09:55grandmother trails laid down by generations of travelers, leading the family down through pristine
10:13temperate rain, temperate rainforests.
10:19And finally, out to the coastal plains.
10:30They are here for one of the few items on the menu at this time of year.
10:40Sedgegrass.
10:41Sedgegrass.
10:44High in protein, it'll tide them over until they reach the salmon.
10:54But for now, nothing beats mom's fat, rich milk.
11:10Life on the road is never peaceful for long.
11:20Highs son of the riders, high Empress.
11:22Smallank 000 morningają.
11:22Thousade-linds,émarjen président and battle queens come here too.
11:29In these meadows, they'll fight for the right to mate.
12:00Mom needs to be careful.
12:10To get to her, the winner would kill her cubs.
12:19Backing off is the only option.
12:35Exhausted from the battle, the hulking male can't keep up.
12:50They've escaped.
13:03With some fuel in their bellies, it's safer to keep moving and continue on to the river.
13:22By midsummer, everyone's joined the race.
13:35To take advantage of this time of plenty.
13:45Rupus hummingbirds have migrated 4,000 miles from Mexico to feed.
13:59A rough-skinned nuke.
14:05On her own miniature trek to the river.
14:12To choose a mate.
14:24And, high above, another traveler is preparing for their incredible journey to the river.
14:55After months of round-the-clock care, this demanding young bald eagle.
15:05Has just gotten his last free meal.
15:16Mom's done everything she can for him.
15:40It's a moment every teenager faces in life.
15:48Time to fly the nest.
15:54And fend for himself.
16:04But it's an 80-foot drop.
16:21The first step of his journey is a leap of faith.
16:40That wasn't so bad.
16:50He's already found his wings.
17:04Spanning six feet wide.
17:09He can glide for miles.
17:15It's a good thing, because now he'll have to live life on the move.
17:26Ahead of him lies a two-month long quest.
17:32Over 800 miles south to a special river in British Columbia.
17:39With a vital run of salmon.
17:48The problem is, traveling alone, this naive youngster has no idea how to get there.
18:09Far downstream, summer runoff has filled the rivers.
18:27Alaska's great salmon race is on.
18:36Leaving the sea behind.
18:45The salmon are entering the lower part of the river.
19:04The salmon are entering the lower part of the river.
19:08When it is in occupation.
19:09The salmon.
19:10This mom-to-be has an amazing memory.
19:16Following sights and smells, logged in her brain when she first swam out to sea.
19:29Where there's a fork in the river, she knows exactly which way to turn.
19:42She's on track, but unfortunately for her, her spawning grounds lie above a 30-mile gauntlet.
19:58Fast-flowing rapids, vicious whirlpools, and towering waterfalls.
20:14But she's no ordinary fish.
20:29She can leap the human equivalent of a four-story built-in.
20:42But she's got to do it again.
20:47And again.
20:54Halfway there.
21:02She's exhausted.
21:10She's not just fighting the current.
21:18No longer feeding, many salmon are already wasting away.
21:26Precious energy used up, morphing their bodies ready to breed.
21:36Some years, 90% don't make it to spawn.
21:46Only the toughest moms-to-be have enough in the tank for one final giant hurdle.
22:19She can only jump halfway.
22:23But thrashing her tail, she can power up the final few feet.
22:35And over the lip of the fall.
22:43Just a few more miles to go.
23:03After months on the road, half starved.
23:11The first time mom's journey has taken its toll.
23:22She's lost one of her two cubs.
23:26She's lost one of her two cubs.
23:26Most likely to a big male.
23:37All of her focus is on keeping her remaining cub alive.
23:46Who's understandably scared of everything.
24:04Finally, the river.
24:18Mom's led her to a special creek.
24:23Where she hopes to fish in safety.
24:29But others have the same idea.
24:41Hunger drives her forward.
24:54Turns out, she's in good company.
24:59This is a secret sanctuary for mothers and cubs.
25:04Away from big male bears.
25:15Time for mom to get fishing.
25:21Just one problem.
25:26The salmon aren't here yet.
25:34And her search takes her into deeper water.
25:42Separated from mom, her cubs on edge.
25:55As fights break out over the prime fishing spots.
26:12She only knows one way to stay safe.
26:23Run.
26:24Run.
26:28Run.
26:30Run.
26:41Run...
26:53Her cubs gone, all alone in the forest, her survival
27:10chances are slim.
27:22It's every mother's worst nightmare.
27:32Her cub could be anywhere.
27:48Like the bear cub, the juvenile bald eagle is lost and all alone.
28:10Running on empty, this clueless teenager has no idea how to reach the feeding grounds
28:19at the river, over 800 miles south.
28:37But if he's learned one thing, it's that other adults mean food.
29:05He follows the male ahead of him, who set his sights on a flock of coots.
29:40Catching one takes experience.
29:44But this hungry rookie has another play.
29:55He's going for an interception, forcing his opponent to fumble.
30:30Now he's just got to hold on.
30:34He's not the only stubborn teenager, forced to make a steal.
31:00He'll eat today.
31:05But a third of juvenile bald eagles won't survive their first year.
31:22Following the elite of adults is the only way you will make it hundreds of miles south
31:33to the salmon.
31:57For over an hour, the bear mom calls out in desperation,
32:05or her lost cub.
32:11Alone in the forest, she's unlikely to last long.
32:26Took the day and the other day when looking old man is at the home.
32:32And then who mutates that or what you don't have to say that?
32:36He thinks he's not the other than the female,
32:36or the maniac.
32:37But he does not even seem to get hungry.
32:38The other person wanted to go to the next race,
32:38but he doesn't have to be aかな touche.
32:38He's not the man.
32:38But his parents wanted to get buckled,
32:39it's still a kind of getting a turnover.
32:39There's only a hard time for the time to go.
32:40The daddy who's a kid now says?
32:44Even if he doesn't have to be a good idea,
32:46the man?
32:55Somehow, she survived.
33:35You don't get many second chances in this harsh wilderness.
33:48Their long journey's almost over.
33:52Just around the corner, everything they've endured is about to pay off.
34:10Battling 100 miles upstream, the first wave of salmon are closing in on their spawning
34:18grounds.
34:31And all the bears are ready.
34:58Everyone can finally dig in.
35:05Up to 40 salmon a day.
35:13It's why mom came all this way.
35:17Let's go.
35:17Let's go.
35:18Let's go.
35:19Let's go.
35:19Let's go.
35:20Let's go.
35:28Let's go.
35:29Let's go.
35:53Fishing seems easy enough.
35:58Time to give it a try.
36:04But they are bigger than they look.
36:07Let's go.
36:21Landing a five-pounder is one thing.
36:28But the real tree...
36:32...is holding on.
36:46This female pink salmon has run an almost impossible obstacle course.
36:57Finally, turning into the stream where she was born.
37:08She's home.
37:13She's one of the lucky ones.
37:17For every thousand fish who set out, only two will survive to spawn.
37:30The waters here are calm enough.
37:34And the gravel just course enough...
37:41...that if she digs out a nest...
37:48...her eggs will remain protected through the winter ahead.
37:57The males that have made it this far...
38:00...have one last brutal challenge.
38:07They must fight...
38:09...to pass on the strongest genes.
38:41The female releases her eggs to the nest...
38:46...and allows the dominant male to fertilize them.
38:53Although others still try to sneak in.
39:03Every extraordinary obstacle she's overcome...
39:09...has led to this.
39:18A whole new generation of tiny travelers...
39:24...wait until next spring...
39:28...when their own adventure...
39:31...will begin.
39:47For their dedicated mother...
39:50...the race is over.
40:04But in death...
40:08...she has one last gift.
40:29Carried far inland...
40:35...to her final resting place.
40:41Salmon release critical nutrients...
40:48...and enrich the soil.
40:57Trees grow three times faster...
41:00...around salmon rivers.
41:07Her sacrifice...
41:10...brings life...
41:11...to the Alaskan wilderness.
41:32With the first snow...
41:35...further south...
41:37...the salmon offer one final prize.
41:53After two months...
41:55...following the other adults...
42:01...the juvenile eagle...
42:05...reaches the river...
42:06...that will nourish him...
42:08...long into the winter.
42:23Warmer waters here...
42:25...means salmon can spawn later...
42:33...providing one last banquet.
42:40...attracting thousands...
42:43...of eagles.
42:54...attracting thousands...
42:59...of eagles.
43:02If he's to survive...
43:05...this youngster...
43:06...will have to take his place...
43:08...at the table.
43:24...but this time...
43:26...other adults...
43:29...facing lean weeks ahead...
43:31...will fight...
43:33...over every last scrap of food.
43:53...to the slum...
43:55...to the end...
43:56...for the last chapel.
43:57...but let's do the last kind of...
43:57...for the next hour...
43:57...the one to the shoulder...
43:57...to the other one...
43:57...to the end...
44:01...the one to the right...
44:29The teen has proven he can hold his hand.
44:41And now that he's learned the way, he's got the best chance to survive.
44:59After two-and-a-half months fishing the Alaskan rivers...
45:09...the first-time mom has gained over 200 pounds.
45:22Enough fat for her and her daughter to make it through the winter ahead.
45:32High up in their mountain den.
45:39Like so many here, their whole lives shaped by the journey of the salmon.
45:51As long as the Alaskan river race continues...
45:57...it will keep them...
46:01...and this incredible place...
46:05...alive.
46:12...and this is the end of the day.
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