- 6/1/2025
Beneath the grassland plains of the Kalahari lies a hidden world of rare and exotic animals. By day, the Kalahari belongs to familiar predators and grazing animals. At night, the earth seems to release scores of seldom seen nocturnal creatures—Bush Babies, Brown Hyenas, Aardvarks and Fungal Termites—in search of food.
Category
📺
TVTranscript
00:00Tonight on NOVA, the African sunset signals the beginning of something wild.
00:07Exotic predators, expert architects, masters of camouflage.
00:14Witness inhabitants of a mysterious underworld surface and take center stage.
00:22A rare glimpse of events few have ever seen.
00:27Night creatures of the Kalahari.
00:51Major funding for NOVA is provided by the Park Foundation.
00:55Dedicated to education and quality television.
01:02This program is funded in part by Northwestern Mutual Life,
01:06which has been protecting families and businesses for generations.
01:10Have you heard from The Quiet Company?
01:12Northwestern Mutual Life.
01:15And by the Corporation for Public Broadcasting and viewers like you.
01:22There is no end to an African day.
01:29Across the grasslands of the Kalahari, the sunset merely signals a new beginning.
01:44As the earth cools in the fading light, zebras, wildebeest and other grazing animals move on.
01:59They are relinquishing the night to a new cast of characters.
02:14Hidden in the shadows, there is a world which few have ever seen.
02:30An endless labyrinth of tunnels and burrows.
02:35Home to the Kalahari's creatures of the night.
02:42The dry season is ending in central Kalahari.
02:48As winter turns to spring, warmer night air will soon be greeting the dwellers of these moonlit portals.
02:57Not all live underground.
03:09A tree gives shelter to this wide-eyed curiosity.
03:16Nine inches of lesser bush baby.
03:19A tiny primate.
03:21One of our distant relatives.
03:24Excellent eyesight.
03:27Grasping hands.
03:28And an amazing agility make them superb catchers of insects.
03:33On the ground, another creature has woken up.
03:45These are spring hairs.
03:48About as big as a rabbit.
03:50The spring hair looks like a small kangaroo.
03:53It feeds on the remaining dried grasses.
03:56And if pursued, it can leap as far as 13 feet in a single bound.
04:00To the left of the bush baby is a tree mouse.
04:06One of the smaller and therefore more careful desert predators.
04:10Less timid than its neighbor, the bush baby illustrates the art of foraging.
04:23The tree mouse scrambles to the ground.
04:36Here it will either find a meal or become one.
04:40Larger predators are now emerging.
04:44The brown hyena.
04:45The brown hyena.
04:46A rarely seen scavenger.
04:59The hole it calls home is not its own creation.
05:03The hyena is merely a squatter in this vast underground burrow stretching out hundreds of yards.
05:12Many of Kalahari's smaller inhabitants could not survive without the protection of these ready-made shelters.
05:18And this is the master digger, the principal architect for Kalahari's underworld.
05:33It is the aardvark.
05:35It is the aardvark.
05:40Translated, its name is earth pig.
05:47Although the name ant bear is often used.
05:50But it is no relation to pig or bear.
05:54The aardvark's nearest relatives are all extinct.
06:01It has a long snout to sniff out food and a long sticky tongue to gather its prey.
06:15The aardvark is a timid creature, relying on sound rather than sight to alert it to danger.
06:23Its diet consists of mostly ants and termites.
06:33But despite its vigorous probing, the termites in this mound are not to be found.
06:44As the aardvark widens its search, a brown hyena prowls nearby.
06:55It is one of the least glimpsed animals of the Kalahari.
07:00The brown hyenas are primarily scavengers, favoring meat from abandoned carcasses over all other food.
07:12But they will also consume eggs, fruit, insects, even the occasional mouse.
07:17Guided by its keen sense of smell, the aardvark has stumbled upon this.
07:32A hill seething with ants.
07:37More often the aardvark must dig for its meal.
07:43But tonight, the ants are within easy reach.
07:47Many ants attempt to repel the invader.
07:54Ineffectual, but irritating nonetheless.
07:57A few seemingly gentle strokes from its sharp claws opens up the hard shell of the mound.
08:12Once inside, its long sticky tongue goes to work.
08:19Satisfied, the aardvark prepares for the coming day.
08:35It doesn't need to find the entrance to its most recent home.
08:42It will simply make a new one.
08:44Demonstrating its well-earned reputation of master digger.
08:54Burrows vary in design.
08:56Many are created to serve as temporary shelter.
08:59Penetrating only a few yards into the ground.
09:02Deeper, more elaborate burrows are excavated for use as maternity dens in the rearing of their young.
09:21Aardvarks can dig at a prodigious rate and could easily escape capture from anyone with a shovel intent on digging them out.
09:29The tail and the hind legs help clear away the soil the massive claws are digging.
09:36In less than 30 minutes, the aardvark has disappeared underground.
09:50Leaving a mound of earth in its wake.
09:56Burrows are not kept for long.
09:58Once abandoned by the aardvark, they provide life-giving shelter for Kalahari's other nocturnal inhabitants.
10:05Porcupines, although capable of digging their own homes, will readily take advantage of these pre-existing burrows.
10:22The male porcupine is the largest rodent in Africa and can grow up to 25 pounds.
10:27The offspring will need their parents' care for about six months, protected from both heat and cold in this second-hand nursery.
10:40Above, the brown hyena is checking for messages.
10:54On the grass stems, other hyenas have left special glandular secretions.
10:59One longer-lasting scent tells whose territory this is.
11:05Another short-lived odor indicates how long ago other hyenas were feeding here.
11:12Scent marking helps the brown hyena keep track of other group members,
11:17which may number as many as 12.
11:20It also helps reduce the need to defend their territory.
11:43An unwary gerbil is caught with surprising speed.
11:47Such a kill is unusual for this nocturnal scavenger.
12:00The scuttle scarcely disturbs the bush baby above.
12:05It's still scoffing insects.
12:10Ever hungry, it thinks it's spotted another victim.
12:17Or has it?
12:19It looks like a stick.
12:23But it did move.
12:30The insect unfurls its wings.
12:33Not designed for flight, they rattle noisily in an attempt to ward off predators.
12:37This bush baby's eyes are bigger than its appetite.
12:48And so is this giant stick insect.
12:50The curiosity soon vanishes fear.
12:51And the perhaps not so hungry bush baby follows the oddity with the passion of a naturalist.
13:03The bush baby decides not to bite off more than it can chew.
13:20The bush baby decides not to bite off more than it can chew.
13:25The bush baby Tilbury.
13:26The bush baby dies again.
13:27The bush baby getsury.
13:28The bush baby下一
13:37With the coming dawn, the creatures of the Kalaharis night returned to their shelters.
13:43filters. Although highly adapted to living in this arid region, they would soon overheat
13:52if left exposed. They will sleep through the day, safe from predators and protected from
14:09the ferocity of the African sun. Oblivious to the underworld beneath them, zebras move out
14:26across the plain, foraging from the sea of dry vegetation that surrounds them.
14:41Because of their larger body sizes, grazers like the zebra can tolerate much higher temperatures.
14:48But large or small, wildlife must find life-sustaining water in their food. For in most of the Kalahari,
15:01which occupies one-third of southern Africa, there is no surface water from which to drink.
15:09For this ant-eating chat, moisture is found in the insects its neighbors will soon be uncovering.
15:22Even though they are active during the day, ground squirrels also require protection from
15:26the sun. The job of hole digging demands constant activity. Vulnerable and exposed, the ground squirrels'
15:48work is often interrupted by having to check for hostile predators.
15:58A lot of effort goes into these daytime retreats. And when the ground squirrels abandon them,
16:05others move in. Meerkats take advantage of the ground squirrels' inadvertently generous nature.
16:13And so are neighbors and squatters beside them on the plain.
16:21Even in this tinder-dry scrub, they know how to root out a juicy insect or two.
16:34Sweeping the horizon with keen eyes, they are constantly on the alert for any approaching threat.
16:41This time, the threat comes from above. One of the season's first storms is approaching.
16:48Unaware of the advancing rain, some need a cue to disappear. Nature provides it.
17:07And in this situation, the threat comes from above.
17:08The earthquake says this, the earthquake says this, the earthquake says this, the earthquake is
17:09the cause of a disaster.
17:10Nature's, the earthquake says this.
17:11It's certainly not in the middle of the sea.
17:12It's very very important.
17:13We can't eat this, the earthquake says this.
17:14It's very much here.
17:15We can't eat this.
17:16We can't eat it.
17:18The rain falls between the water.
17:19We can eat it.
17:20We can eat it.
17:21It's veryLD.
17:22Generally, rain falls in the warmer months, between October and April.
17:27Often it will come in violent, torrential downpours.
17:31And when it comes from above the river in most water, we can eat it.
17:36Because of these seasonal rains, much of the Kalahari is not, in fact, a true desert, despite its reputation.
17:47The rains are often local and patchy. Some areas remain dry for years.
17:57Highly tolerant, the vegetation is adapted to these drought conditions, renewing itself through seeds when the life-giving storms finally do arrive.
18:21What was a dusty plain will very quickly flush green. The freshly disturbed earth around each hole in the ground is the first to show new growth.
18:34It is burrowing animals that provide the water with a path to flow, allowing it to soak the soil and become available for plants.
18:44Fortunately, the tunnels don't flood at every level, and the passage is quickly dried.
18:51Soon, life resumes with more predictable patterns.
18:56Following the torrent of localized rain, the stage is set for a most spectacular event.
19:15It is burrowing animals that can be used in the past.
19:36Winged termites take to the air just once in their lives.
19:42These flyers are called alates, and are produced to leave the mound in order to establish new colonies.
19:49In termite mounds all over the Kalahari, this exodus of potential kings and queens happens just once a year, triggered by strong rains.
20:04The rain has brought out other arrivals just beyond the swarming mound.
20:24The giant bullfrog's arrival is opportune. It has a taste for termites.
20:31Without a strong wind, many of these winged termites will not travel far.
20:46Once on the ground, the wings are discarded.
20:53Now, kings pursue queens, but not unobserved.
20:58This annual phenomenon provides the termites with very little chance for success.
21:05Only a few couples will escape.
21:15Paired kings and queens equipped with huge fat reserves will hide in cracks in the ground or find refuge in trees.
21:23There, each will attempt to find a new colony.
21:33Animals of all shapes and sizes come to satisfy their appetites.
21:44Even a gerbil will risk leaving its home on this particular night.
21:54It's the shifting equilibrium between predators and prey that keeps the Kalahari full of life and under natural control.
22:12The delicate sound of rustling wings is a clear signal for the bad-eared fox.
22:20Although related, it is not a true fox.
22:23Its huge ears and small teeth put it in a subfamily all its own.
22:34Most of its food is insects.
22:37Special jaw muscles allow it to chew rapidly.
22:42Ideal for coping with termites.
22:50Prey is located primarily through hearing.
22:53Using their very specialized ears, they can even detect the movements of insect larvae buried in the ground.
23:00The last winged termites leave the mound.
23:11The workers are busy sealing the doors for another year.
23:15In just a few hours, the spectacle is over.
23:19The African hedgehog also took its share of termites.
23:26And it will eat almost anything else it comes across.
23:29It has longer legs and different facial markings compared to its European cousins.
23:38The termites were of no concern to the porcupine family.
23:53The porcupines love to feast on Sama melons.
24:00With a water content of more than 90%, they are a valuable source of moisture.
24:06The porcupine pairs are monogamous.
24:13And it is the female that initiates mating.
24:20She will typically conceive only once a year with litter sizes varying between one and three.
24:33The young arrive well-developed, attaining adult body mass in just over a year.
24:48Due to the porcupine's effective, defensive spines, suckling begins with a bothersome search.
24:56The sought-after nipples are not on the mother's underbelly,
24:59but positioned further up on the side of her body,
25:02covered and surrounded by sharp quills.
25:06Their desire for milk is so strong,
25:10they'll put up with this for nearly five months,
25:13although they've been able to take solids since they were four weeks old.
25:17The End
25:19The End
25:20The End
25:22Baby hedgehogs are totally reliant on their mother's milk.
25:37These newborn are waiting for her return.
25:44Despite their quills, hedgehogs and porcupines are quite unrelated.
25:50Unlike porcupines, the hedgehog mother has no mate to help raise the family she's going back to.
26:09When born, the baby's sharp spines have not yet cut through the skin.
26:22But over the first two weeks, the eyes open, hair grows, and the spines push through and harden.
26:29Very soon, they will have the defensive knack of rolling into an inedible spiky ball.
26:36The burrow will be their den for six to seven weeks.
26:44After that time, they'll be expected to venture out on their own.
26:49So warm and safe is this home, that when the time comes, their mother may have to push them out.
27:14When not raising young, these nocturnal creatures will change their resting places daily,
27:20curling up in holes, under bushes, or beneath matted grass.
27:31An abandoned termite mound is the home for this familiar-looking creature.
27:36But this is no house pet.
27:40Called the black-footed cat, it is the smallest member of the Kalahari's wild cat family.
27:51When it lacks in size, it makes up in ferocity.
27:57Because of its aggressive nature, it is unmanageable in captivity, despite its appearance.
28:06Mice are its favorite food, but it will readily attack other small mammals.
28:12With a few exceptions.
28:15Such as this nearby hedgehog, puffing along contentedly in search of food.
28:20The black-footed cat approaches.
28:36But unwilling to risk the sharp prickly spines of the hedgehog, it quickly retreats.
28:41Black-footed cats have two or three kittens in a litter.
28:55And this one can't wait to leave home.
28:57The other kittens are not quite as brave, and stay home.
28:58The other kittens are not quite as brave, and stay home.
29:07The boulder kitten is ready for a lesson in hunting technique.
29:14He must learn to hunt very quickly in this forbidding environment.
29:20Playing follow the leader, the kitten duplicates its mother's every move.
29:21For the less adventurous, there's always a way to do it.
29:22The boulder kitten is ready for a lesson in hunting technique.
29:23The boulder kitten is ready for a lesson in hunting technique.
29:28He must learn to hunt very quickly in this forbidding environment.
29:33Playing follow the leader, the kitten duplicates its mother's every move.
29:46For the less adventurous, there's always a brother or sister to practice on.
29:53For the less adventurous, there is a sign in hunting technique.
29:59Can we get caught on the bus?
30:03And this could be the wise, to play.
30:06We wish that he's a scientist, and she wants to look too young.
30:12And we try to hunt very quickly in hunting technique.
30:13We will get caught on the bus.
30:15The mother returns home, but the kitten is not yet ready to follow.
30:45The sound of potential prey prompts the mother to investigate.
31:05Another sound, this time of a potential predator, encourages the bold kitten to call it a night.
31:15The black-footed cat's larger and more common relatives are feeding tonight.
31:25Though sometimes active during the day, lions are primarily nocturnal.
31:31As they squabble among themselves, others are tempted out by the smell of blood in the air.
31:42Unlike spotted hyenas, which hunt and kill in packs, the brown hyena won't disturb the meal.
31:58They'll wait until the lions leave before approaching the carcass.
32:08Until then, it's time to be patient and indulge in a display of affection.
32:22Hyenas are perhaps one of the most misunderstood and maligned of creatures.
32:32Because of their eerie nighttime calls and secretive scavenging nature,
32:36they are considered animals of doom and misfortune among many African natives.
32:42Their true nature is rarely, if ever seen.
32:48The lions leave.
33:16The lions leave.
33:18Now, they can venture in and sift through what's left.
33:24Brown hyenas have remarkable digestive systems and an unusual range of tastes and food.
33:35They will even eat fruit, an important supplement in this arid region.
33:43After finding a kill, they will readily eat what other animals have discarded.
33:51Their powerful jaws can crush bone, which contains nutritious marrow inside.
33:59Not much is left of this springbok ram.
34:03But it's a better meal than many.
34:09Not much is left of this springbok ram.
34:11Sometimes brown hyenas will travel as much as 30 miles in a single night.
34:15Even then, they may only pick up a few scant insects for their efforts.
34:21Nothing goes to waste in the Kalahari.
34:31You may be among other animals.
34:32You may be among others.
34:34You're the only scanthat in the Kalahari.
34:36They may recognize the whole of the conditions of the ship.
34:37Things are a big part of their skill.
34:38You may take the time to take the time to put the stock together.
34:39You may not be in the near future.
34:40You may not be in the near future.
34:41There may be a few scantins that you need to drink.
34:42You may not be in the near future.
34:45As the wet season runs its course, the sun rises over a sea of green.
35:10This lush, flowered garden will be put to good use until the plains, once again, dry out.
35:30A feast awaits the mostly vegetarian ground squirrel.
35:37It may eat an insect now and again, but its diet consists primarily of leaves, grass, bulbs, roots, and on this day, seeds.
35:53Like most of Kalahari's creatures, it receives moisture from its food and can live without the presence of standing water.
36:08Aptly named, ground squirrels are poor climbers, but they will scramble up the occasional bush in search of berries.
36:17Otherwise, feeding is strictly a terrestrial activity.
36:29After the meal, it returns to work on the den.
36:32The damp soil is easy to remove.
36:35But for the moment, play takes precedence.
36:39But these days of plenty will soon be over.
37:07In March, as the dry season descends, temperatures soar to over 100 degrees.
37:23Only a ruffled, dry carpet of grass remains.
37:43Hard at work on these grasses are harvester termites, one of many insect families that farm the Kalahari.
37:53They cut down stalks of dry grass to a manageable size and drag them down into their tunnels 30 feet below.
38:01Provisions against harder times.
38:11Waiting to feed upon the termites are predators like the scorpion and the ant-eating chat.
38:17Each termite, worker or soldier, is a succulent snack.
38:31For predators, they are small packets of life-sustaining moisture.
38:45Close by, a sand wasp is preparing for its future.
38:49She's paralyzed a caterpillar, which she will take into a hole she dug earlier.
38:55First, she'll have to open the entrance.
38:59On the living caterpillar, she lays one egg.
39:03Soon, the paralyzed victim will be a fresh meal for her single larva.
39:07Before leaving, the small stone over the opening is replaced.
39:15She may repeat the same process a dozen times in her lifetime.
39:21Still working on the stalks of dried grass, the termites' habit of moving plant material underground plays an enormous role in nutrient cycling.
39:37Their fat, rich bodies are also a key link in the Kalahari food chain.
39:45The ant-eating chat has more than a beak full ready to bring to her brood in a very unusual home.
39:53Such a wealth of food enables the chats to nest in this dry time of year.
39:59But where?
40:05She's at the entrance to an aardvark burrow, now occupied by a brown hyena.
40:13The resident doesn't seem to mind the intrusion.
40:27Both parents are feeding the chicks, whose cries are coming from a hole in the roof of the tunnel.
40:43Although it can excavate its own burrow for nesting, it more often chooses the ready-made shelter of an aardvark hole.
40:51The dry season is also nesting time for the world's largest bird.
41:11The male ostrich is about to change places with the female.
41:17It's now his turn to incubate the eggs.
41:24Heat is the biggest enemy.
41:28The temperature is high, even in the shade.
41:32Unattended, eggs can easily spoil in the Kalahari sun.
41:38Other females also lay eggs in the nest.
41:42This minimizes the risk of losing an entire clutch to predators.
41:54But each set of parents knows its own eggs and tries to keep them positioned in the center of the nest.
42:03During these daytime vigils, the ostrich can become heat-stressed.
42:08But it can tolerate the loss of up to 25% of its body weight in water, without ill effect.
42:22In the heat of the day, soil temperature can rise to over 150 degrees.
42:31But in the labyrinth of burrows beneath this scorching landscape, it can be as much as 50% cooler.
42:41For the Kalahari's nocturnal creatures, this retreat is key to their survival.
43:04Daytime grazers also seek protection when temperatures are at their highest.
43:11Lying in the shade of trees or bushes helps reduce water loss and keeps body temperatures from soaring.
43:21Diurnal animals have adapted in other ways.
43:24Pound for pound, they require less water and use less energy to survive.
43:30Their body tissue can also store a much larger amount of heat.
43:34Six weeks after being laid, the ostrich eggs have hatched, sending as many as ten miniature versions of their parents out into the world.
43:57They will grow at a remarkable rate, from six inches to eight feet in their first year.
44:08But not all the eggs hatch.
44:19Sometimes, despite the best efforts of their parents, they become spoiled in the heat and are abandoned.
44:26The failures will not go to waste.
44:30The eggs represent nourishment for the less discerning of Kalahari's nightlife.
44:35As the dry season advances, the sun's warming rays quickly dissipate into the clear evening sky.
44:51Because of the region's relatively high altitude, temperatures in winter can drop below freezing.
45:04Cold becomes another enemy.
45:09Cold becomes another enemy.
45:26But tonight, winter's grip has not yet taken hold.
45:30And the Kalahari's nocturnal prowlers are free to roam.
45:40The denizens of the underworld stir in their burrows.
45:47The bush babies seem less interested in grasshoppers this evening, and more interested in each other.
45:57The master digger ventures out, concerned quite literally with sticking to its diet of ants and termites.
46:07It's just a slight distraction to the bush babies who are keen on courtship.
46:18The prelude to mating involves the gentlest of caresses.
46:32And then, a series of gymnastic displays.
46:38Leaping up to 15 feet in a single bound.
46:41The hyena has caught the smell of rotting ostrich eggs.
47:06They're a welcome seasonal bonus.
47:13The hyenas have been observed removing over 20 eggs from a nest.
47:42One by one, hiding them for later.
47:47For all but a few animals, these eggs present a tricky problem.
47:51Ostrich eggs are designed to be broken from the inside at the right time.
47:57The hyena will need to use its bone-crushing jaws.
48:02The hyena will need to use its bone-crushing jaws.
48:06With a little persuasion, the egg gives up its spoiled contents to an animal with just the stomach for such a pungent delicacy.
48:25Another of the Kalahari's underground creatures surfaces to find its first meal of the night.
48:52The conspicuous coloring of the striped polecat warns others to stay clear.
48:59Like the skunk, it will release a nauseating spray if threatened.
49:05Its diet is primarily insects, but it will readily consume more exotic fare.
49:17Scorpions hide in other animals' burrows as well.
49:22Like almost everything else, it's looking for a meal.
49:27It has a powerful sting, but against a much larger predator, it stands little chance of escape.
49:34To the striped polecat, the scorpion is not a difficult challenge.
49:53The larger predator first bites off the tail, which can deliver a painful sting.
50:12To the scorpion, termites were thirst-quenchers.
50:19Now it unwillingly provides the same service for the striped polecat.
50:24A link in the chain of appetites foraging in the dark.
50:41Changing seasons mean changing diets for the hunters and scavengers of the Kalahari's night.
50:48As the weather cools, it is often ants and not termites that are more readily available for feasting.
50:55During the meal, the aardvark will inadvertently consume grass seed the ants have stored.
51:03Because he cannot digest the seed, it will be deposited on soil which the aardvark then buries.
51:10Beyond his title of master digger, the aardvark is one of the Kalahari's master planters as well.
51:33And so, it's on to the next job at hand.
51:39An after-dinner dig, which will take the aardvark into the deepest recesses of the underworld.
51:48Providing once again additional shelter for those less capable of such grand excavation.
51:55A master bedroom in the making.
52:04Familiar sounds and smells alert the nocturnal cast of the imminent sunrise.
52:21Travel weary but well fed, the brown hyena returns to its burrow.
52:31The others soon follow suit.
52:36Soon, the only traces left of these strange creatures will be the dark portals to their hidden world.
52:54Gone, but not forgotten.
52:56Gone, but not forgotten.
53:01The creatures of the night play a vital role in the regeneration of this arid land.
53:09Without them, this fragile web of life would all but disappear.
53:28Night vision.
53:29Where we see only darkness, some animals see their next meal.
53:33How do they do it?
53:34Nova's website shines a spotlight on the nocturnal eye.
53:38See for yourself at www.pbs.org.
53:39See for yourself at www.pbs.org.
53:40See for yourself at www.pbs.org.
53:45www.pbs.org.
53:52Night vision.
53:53Where we see only darkness, some animals see their next meal.
53:58How do they do it?
53:59Nova's website shines a spotlight on the nocturnal eye.
54:02See for yourself at www.pbs.org.
54:06To order this show for $19.95 plus shipping and handling, call 1-800-255-9424.
54:26And, to learn more about how science can solve the mysteries of our world, ask about our many
54:32other Nova videos.
54:36Things are in the same way.
54:38Whoa!
54:41We are now going to get to them.
54:43Let's get started.
54:45Your life is in the same way.
54:48How do we get you?
54:50We are gonna get you?
54:55How do we get you?
55:01How do we get you?
55:03Nova is a production of WGBH Boston.
55:33Major funding for Nova is provided by the Park Foundation, dedicated to education and quality television.
55:45This program is funded in part by Northwestern Mutual Life, which has been protecting families and businesses for generations.
55:54Have you heard from The Quiet Company?
55:56Northwestern Mutual Life.
55:57And by the Corporation for Public Broadcasting and viewers like you.
56:09This is PBS.
56:14Imagine Antarctica melting.
56:22A Cold War disaster kept secret for decades.
56:27Blonde-haired mummies from China.
56:32No escape from a crocodile's deadly grip.
56:36Surviving the death zone on Mount Everest.
56:39Imagine no further.
56:42Watch it on Nova.
Recommended
57:55
|
Up next
1:28
1:25
57:21
34:34
4:40
47:03
56:39
1:52:57
1:50:57
56:37
56:39
56:32
59:57
56:26
1:26:52
56:32