Trek Spy On The Wildebeest

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00:00:06 This is the great
00:00:13 The story of Africa's
00:00:16 is captured by
00:00:22 Only cameras concealed in
00:00:25 could capture such intimate images.
00:00:35 Here, they spy on the moment the
00:00:40 Their greatest challenge on
00:00:49 The hidden cameras immerse us
00:00:53 experiencing the drama
00:01:02 They show what it's like
00:01:14 Wildebeest undertake
00:01:19 Their epic march creates a spectacle
00:01:31 Over one and a quarter million
00:01:34 participate in the migration,
00:01:37 but each individual has its own
00:01:44 The adult females
00:01:46 These yet-to-be-born calves
00:02:19 We will see how they overcome
00:02:23 whether from predators...
00:02:34 Hundreds of individuals were filmed
00:02:40 as it makes the most challenging
00:03:01 After crossing the Mara River,
00:03:03 the herds follow the seasonal rains
00:03:06 and head south to the lush plains
00:03:08 of Tanzania's Serengeti.
00:03:11 Here, volcanic soils create pasture
00:03:19 And it's here that wildebeest
00:03:23 on a journey that takes a year
00:03:31 Their appearance
00:03:34 For lush pasture is not the only
00:03:42 Africa's top predators are
00:03:50 Each February,
00:03:56 In just three short weeks, over
00:04:07 It's with this moment of birth
00:04:19 Delivery is quick,
00:04:30 Mother and calf
00:04:34 based on smell, taste and sight.
00:04:37 It's this relationship
00:04:49 This is his most vulnerable time.
00:04:56 Hyenas - they may
00:05:00 but for such easy pickings,
00:05:20 Vulnerable newborns
00:05:25 Other antelopes
00:05:27 but wildebeest calves must be ready
00:05:33 He has just minutes
00:05:45 Hyenas prefer the easy option,
00:05:48 and prey doesn't come
00:05:59 To survive,
00:06:32 Hyenas separate
00:06:35 In this way,
00:06:42 They hunt with both sight
00:06:58 The calf learns to use his legs
00:07:09 He's up and walking
00:07:23 It's not a moment too soon.
00:07:29 He faces his first deadly challenge.
00:08:08 He's already proving his strength,
00:08:10 few calves can outrun a hyena
00:08:17 And he's taken the first steps on
00:08:32 Danger past,
00:08:36 This begins the unbreakable bond
00:08:41 One that will last the whole journey
00:09:28 Tortoise-cam
00:09:32 used to film the calf's story.
00:09:35 Between them, they will record
00:09:45 Tortoise-cam's harmless appearance
00:09:48 lets him infiltrate the herd.
00:09:50 Protected by a hard shell, he's
00:09:59 Helped by other
00:10:01 he will spy on the calf
00:10:13 Dawn brings no respite from danger.
00:11:01 Having young together helps
00:11:06 The mothers form nursery herds,
00:11:12 A territorial male attaches himself
00:11:18 and drives out
00:11:24 Ousting the males creates
00:11:29 within the super herd.
00:11:39 The calf may sometimes
00:11:41 but having a male around
00:11:54 Lions are an ever-present danger
00:11:59 nomadic lions
00:12:13 As the male tries to keep control,
00:12:21 To increase their chances,
00:12:37 One lioness stalks directly forward.
00:12:40 Her aim is to close the gap
00:12:49 Another attempts
00:12:59 They will try to stalk to within
00:13:09 Lions find it hard to outrun
00:13:12 so every inch nearer
00:14:10 One lioness finds a target...
00:14:12 the calf.
00:14:15 But the herd panics across her path,
00:14:20 and she spots a new victim.
00:14:30 Both calf and mother escape.
00:14:48 But in the chaos, the calf
00:14:59 He desperately needs to find her
00:15:11 But the mother is just one
00:15:23 He checks every wildebeest he meets,
00:15:49 Without the herd,
00:15:52 and the lions are not far away.
00:16:02 The lions may be distracted now,
00:16:06 The birth of their cubs
00:16:24 The calf's smell is unfamiliar.
00:16:27 He will never be adopted
00:16:29 even if she has lost her own calf.
00:16:48 The herd drifts away.
00:16:55 His call is unique,
00:17:08 Vultures keep an eye on everything
00:17:12 They react quickly
00:17:19 Lions don't give up their kill
00:17:23 it's easier to take a more
00:17:32 But for some,
00:17:46 The vultures are used to this game.
00:17:49 They make their living
00:17:59 Time is on the vultures' side.
00:18:13 He may be frustrated,
00:18:20 As the day heats up, the desire
00:18:26 This is a battle that vultures
00:18:43 Lost calves are so desperate
00:18:46 they will attempt to befriend
00:18:49 Even zebra are better than nothing.
00:19:08 But there is no warm welcome here
00:19:25 Hyenas have now picked up
00:19:40 But a lone calf
00:19:57 Instinctively, he heads for
00:20:05 It may not be his herd,
00:20:08 but this was a fortunate move.
00:20:14 Zebras often tackle a threat
00:20:19 at full throttle,
00:20:25 By comparison,
00:20:28 even if it means battling it out
00:20:59 Between them, they will quickly
00:21:08 It's midday, and the lost calf
00:21:18 Even his reluctant companions
00:21:28 Starved of his mother's milk,
00:21:39 No calf below six months old
00:21:46 But there is still hope
00:21:56 The herd returns.
00:22:06 Whilst there is fresh grass to eat,
00:22:16 He searches again,
00:22:19 all adult wildebeest look the same.
00:22:27 Sound is a more reliable guide,
00:22:30 he can recognise his mother's call
00:22:38 A glimmer of recognition,**
00:22:39 but smell is the final confirmation
00:23:04 Remarkably, 95% of lost calves
00:23:11 Suckling reinforces the strong bond
00:23:16 Once more, the herd provides
00:23:20 especially against an old enemy.
00:23:28 Now, a lost eland calf
00:23:39 The wildebeest calf was lucky
00:24:03 Dung-cam, a camera modelled
00:24:08 is soon capturing some
00:24:13 Hyenas have devised a method
00:24:16 of their surplus food.
00:24:20 The eland calf is destined for
00:24:24 as are the remnants
00:24:36 Water not only hides the food,
00:24:38 but conceals the smell
00:24:43 Skull-cam is in dangerous company.
00:24:50 Hyenas spend the hottest
00:24:53 but this is also the time
00:24:55 when thirsty calves
00:25:00 They have no choice
00:25:08 Dung-cam takes up battle stations,
00:25:12 but a gorged and lazy hyena
00:25:30 Wildebeest have learnt to live
00:25:35 making the most of
00:25:54 But a calf is never
00:26:02 Hyenas can turn nasty at any moment.
00:26:11 But then
00:26:14 the wildebeest go on the offensive.
00:26:30 The mother, defending her calf,
00:26:40 The hyena has deadly enemies
00:26:46 This is the worst mistake
00:26:56 Hyenas will steal food from lions
00:27:03 This looks like revenge.
00:27:21 A lioness vents her anger too,
00:27:39 The war between lions and hyenas
00:27:45 Even for a whole pride,
00:28:37 It's late April, and the lush
00:28:43 and become a barren wasteland.
00:28:47 Dust devils whip the dust
00:28:51 A new and puzzling sight
00:29:20 As the choking clouds
00:29:23 the herd treks southwards
00:29:25 seeking greener pasture
00:29:31 Our spy-cams travel with them.
00:29:36 Meet dragonfly-cam.
00:29:39 Small and quiet, it can fly close
00:29:46 It tracks the wildebeest south
00:29:59 For higher views,
00:30:04 It can zoom into a detail
00:30:16 Ahead lies Lake Ndutu,
00:30:32 By now, the calf is used to being
00:30:35 but as the herd approaches the lake,
00:30:38 he is about to encounter
00:30:50 Lake Ndutu is a soda lake
00:30:54 Although the calf must be thirsty,
00:30:56 he has no alternative but to
00:31:18 The calf needs to hurry.
00:31:20 Too long in the water,
00:31:36 The calf's first experience
00:31:40 and he still has a way to go.
00:31:48 A mile across, the lake is
00:31:54 Fortunately, there are
00:31:58 and he's taken to swimming
00:32:11 Powerful strokes drive him forward.
00:32:25 Guided by his mother,
00:32:39 This ordeal by water
00:32:49 Having crossed the lake,
00:32:53 into new fresh pasture, where the
00:33:17 Grass-cam is there to greet them.
00:33:23 But it's natural grass
00:33:32 Replenished by these lush meadows,
00:33:34 there's even time
00:33:40 It's not only calves
00:33:59 Cheetahs are the fastest running
00:34:02 and one in every two of their hunts
00:34:18 For the calves,
00:34:32 But for all their speed, cheetahs
00:34:53 A cheetah cannot sustain top speed
00:35:00 Spotting the predator before he ran
00:35:15 In a few weeks, following the yearly
00:35:18 the calf's herd
00:35:29 They finally reach the acacia
00:35:34 It's taken the calf
00:35:42 Here, the calf will find
00:35:45 and good grazing
00:35:59 But here lurks Africa's
00:36:10 Leopards are the stealth hunters
00:36:18 Masters of surprise,
00:36:42 But for a six-month-old cub,
00:36:52 The bird's distraction display
00:37:07 Today, the cub only manages
00:37:12 It will be at least a year
00:37:32 It's June, and midsummer madness
00:37:35 seems to have gone
00:37:40 This tree-rubbing
00:37:45 The thrashing of young saplings
00:37:50 helps stop the spread
00:37:52 The destruction inadvertently
00:38:01 As well as needing good pasture,
00:38:08 Simply waiting for a meal to arrive
00:38:11 is the lazy lion's approach
00:38:19 It's just a matter of remembering
00:38:26 The calf has every reason
00:38:43 The need for daily water
00:38:51 The entire population drinks three
00:39:11 No longer dependent
00:39:14 the calf guzzles his fair share.
00:39:17 Head down,
00:39:27 They sense danger.
00:39:32 She isolates the calf,
00:39:41 ..and dust creates
00:39:53 Only one in five hunts
00:40:18 The trek moves on northwards
00:40:28 The herd will soon arrive
00:40:32 in the whole of Africa.
00:40:37 The calm waters of the
00:40:42 To capture the upcoming drama,
00:40:44 the river has been staked out
00:40:59 A new camera makes an appearance.
00:41:05 Hippo-cam is designed to blend in
00:41:27 Hippos can be aggressive,
00:41:36 These are the biggest
00:41:48 Even Africa's biggest mammal
00:42:01 Some are over 20 feet long
00:42:08 They may not have eaten
00:42:12 But food is about to arrive.
00:42:21 It's rush hour, and for a baboon,
00:42:23 the traffic to the river
00:42:35 It's best to look both ways!
00:42:42 The crocodile's long hungry wait
00:43:31 Wildebeest are always nervous facing
00:43:37 who can blame them?
00:43:39 For the calf,
00:43:44 but the confidence of others
00:43:53 If undisturbed, wildebeest can drink
00:44:15 As his confidence builds,
00:44:33 The herd is bewildered. Some have
00:44:46 Even as the full horror unfurls,
00:44:49 there is great confusion
00:45:04 And that was just the first attack.
00:45:14 300 hungry crocodiles
00:45:29 Wildebeest react differently
00:45:33 Even the adults seem unsure of
00:45:40 The calf's desire
00:45:43 overcomes any fear he may have.
00:45:58 The crocodiles manoeuvre
00:46:03 They are intelligent hunters,
00:46:06 plotting their attack
00:46:20 A strike can happen at any time.
00:46:43 Despite the carnage,
00:46:46 They stampede back onto the plains.
00:46:59 For the baboons,
00:47:04 They might as well settle down,
00:47:08 can take some time
00:47:21 But crocodiles are co-operative
00:47:31 The death roll breaks the prey
00:47:36 but aggression can spill over.
00:47:52 The calf has survived
00:47:56 but as the river is
00:47:59 tomorrow,
00:48:13 Meanwhile, our tortoise-cam
00:48:56 For tortoise-cam,
00:49:06 And these bulls
00:49:10 It's the rutting season.
00:49:12 Three weeks of mayhem in which
00:49:17 Not the time to be stuck
00:49:37 It's a test of
00:49:44 The winner returns to the females.
00:49:49 At this time, a collective madness
00:49:54 The clashes can be quite violent.
00:50:05 Each bull tries to round up
00:50:13 The calf gets caught up
00:50:15 as his mother
00:50:25 It's a chaotic and confusing time
00:50:38 During the rut,
00:50:42 they're so charged up
00:50:46 They have to stay on guard
00:50:52 It's total pandemonium
00:50:56 try to steal the females.
00:51:04 They run through other males'
00:51:07 scattering the herd
00:51:17 Troublemakers
00:51:27 For the calf, it must be a relief
00:51:44 But for a male guarding females,
00:51:49 Challengers are always on the prowl.
00:51:57 The calf can only
00:52:01 He soon becomes caught up
00:52:08 The bull springs into action.
00:52:18 He sees off his rival
00:52:23 Matings are more successful in
00:52:27 95% succeed.
00:52:35 After all that activity,
00:52:42 But dragonfly-cam is experiencing
00:52:48 Its transmitter
00:53:00 Dragonfly-cam refuses to die.
00:53:03 It gamely tries to continue
00:53:16 Even grounded, it keeps on filming.
00:53:22 The rut has proved thirsty work.
00:53:31 This time,
00:53:37 Sensing danger, the calf holds back.
00:53:41 But crocodiles still seem
00:53:47 and other animals
00:53:52 Guinea fowl seem remarkably happy
00:54:11 A yellow-billed stork
00:54:19 All the signals are reassuring.
00:54:22 A baboon with young appears relaxed,
00:54:24 even with a crocodile
00:54:37 Wildebeest are highly tuned to the
00:54:41 Apparently,
00:55:05 But a glossy starling
00:55:20 The calf takes his cue
00:55:32 He can still stare death in the face
00:55:40 A crocodile's low profile
00:55:46 It isn't seen as a threat.
00:56:13 Nose to nose,
00:56:15 but the calf is still oblivious
00:56:46 The teeth miss by inches.
00:56:54 He may have escaped
00:56:58 but his mother is not so lucky.
00:57:07 Without her, the calf is doomed.
00:57:15 But the croc can't keep his grip.
00:57:27 The bond between mother and calf has
00:57:34 but will it be enough to overcome
00:57:38 In the next programme, the calf
00:57:42 where he faces the greatest
00:57:54 Subtitles by Red Bee Media Ltd - 2007
00:57:58 E-mail subtitling@bbc.co.uk
00:00:14 It began with the birth of a calf.
00:00:19 He was soon faced with many dangers.
00:00:34 The calf even crossed a soda lake.
00:00:41 A variety of spy-cams
00:00:46 These recorded his adventures
00:00:53 They filmed him surviving an attack
00:01:02 They even withstood
00:01:07 They then staked-out
00:01:14 ..where Africa's biggest crocodiles
00:01:25 This was his closest shave so far.
00:01:28 Now, even greater tests await
00:01:50 The Mara River in Kenya, the most
00:01:56 It's late July and the march
00:02:01 as it faces
00:02:06 But there's no turning back.
00:02:10 The wildebeest arrive
00:02:13 a unified mob on a frantic mission.
00:02:17 For the adults,
00:02:22 For the calf, it's the biggest
00:02:36 The crossing points are traditional,
00:02:38 but that doesn't make them
00:02:40 particularly when the river
00:02:51 Ferocious rapids lie
00:02:56 Each year,
00:03:00 The calf faces
00:03:08 It will be a major test, one
00:03:18 A gazelle seems remarkably
00:03:25 The calf waits but, for the herd,
00:03:28 the gazelle's impulsiveness
00:03:39 As the first ones leap,
00:03:40 it's like pressure
00:03:50 Mother and calf wait their turn.
00:03:55 The front-runners leap wildly,
00:03:57 a technique that probably scares
00:04:05 But the same splashes also sound the
00:04:18 The one that took the greatest risk
00:04:26 Although nervous,
00:04:28 the calf is pressurised by herds
00:04:32 They force him to take the plunge.
00:04:41 At six months old, he is strong
00:04:46 but this will test his stamina
00:04:58 The rapids lie just downstream.
00:05:12 The teeming throng force the mother
00:05:19 The pressure builds still more.
00:05:24 The calf stumbles on hidden rocks
00:05:40 Mother and calf are both
00:05:52 The whole herd is
00:05:57 Many retreat,
00:06:02 For the calf and his mother,
00:06:15 Briefly, he finds a foothold...
00:06:25 Then, panic sets in.
00:06:40 Crocodiles deliberately select
00:06:46 Mother and calf
00:06:50 The mother is grabbed...
00:06:52 The calf is swept away.
00:07:01 The current is so strong
00:07:08 Only a rock stops their struggles.
00:07:11 The calf, too,
00:07:30 But the crocodile's hold is awkward.
00:07:38 Reinforcements arrive.
00:07:42 The crocodile is tiring
00:07:51 Miraculously, the mother
00:07:55 The calf
00:08:07 The crocodile is exhausted.
00:08:09 It has to let her go.
00:08:33 Mother and calf
00:08:48 Together, they make it ashore.
00:08:52 Others are not so lucky.
00:09:16 Every river claims its victims, but
00:09:45 Cheetahs love
00:09:49 There's plenty of space for hunting.
00:10:10 The wildebeest will eat most
00:10:16 The grass reacts by growing.
00:10:19 The more grazing and
00:10:21 the more it's stimulated to grow.
00:10:28 But paradise comes at a price.
00:10:31 As well as cheetahs, the migration
00:10:43 Lions live here in higher densities
00:10:51 And the days of the migration
00:11:06 The wildebeest will stay here
00:11:09 so the threat is something
00:11:29 The middle of the herd
00:12:01 This cheetah cub
00:12:16 Like all youngsters,
00:12:24 But his mother has work to do.
00:12:42 The wildebeest have
00:12:46 Thousands of gazelle
00:12:51 Each kind of animal
00:12:55 Thompson gazelles eat the shoots
00:13:20 The long red-oat grass
00:13:24 but it's too long
00:13:31 Given the choice,
00:13:33 wildebeest prefer pastures that
00:13:41 The calf runs.
00:13:47 But this time he is not
00:14:14 Tortoise-cam investigates.
00:14:31 This apparently harmless creature
00:14:57 The cub is not old enough
00:15:00 but it is risky for him
00:15:03 He looks for his mother.
00:15:07 There is plenty to be nervous about.
00:15:13 These are halcyon days
00:15:24 A ready-made meal is never far away.
00:15:30 At this age, the calf makes
00:15:38 Hyenas look for signs of weakness.
00:15:43 Despite their reputation,
00:15:47 But when someone else
00:15:50 they soon sniff out an easy meal.
00:16:12 Her cub is in mortal danger.
00:16:23 But even for a hyena,
00:16:25 a protective mother
00:16:43 He looks for an easier option.
00:16:49 Among the multitudes, there's
00:17:08 When they reached the Mara,
00:17:10 the population that peaked
00:17:13 on the calving grounds has lost
00:17:18 Most of those that died were calves.
00:17:29 Black-backed jackals
00:17:34 They are expert at snatching food
00:17:40 They live on their wits,
00:17:56 They also give other scavengers
00:18:03 Like a gigantic living lawn-mower,
00:18:08 across the plains,
00:18:13 Here the calf will spend a
00:18:21 With the herd staying in one place,
00:18:27 Even a tree stump spies on
00:18:52 Boulder-cam, was first used
00:18:58 Now, it finds a new
00:19:03 As always, the lions' first reaction
00:19:09 But these cats are more
00:19:25 One cub has taken to it
00:19:46 Boulder-cam doubles up
00:20:44 But then the mood changes.
00:20:48 Boulder-cam captures
00:20:53 of a stalking lioness.
00:20:56 Every day,
00:21:00 In the Mara, the river provides
00:21:04 the herds can rely on.
00:21:11 The calf joins the midday throng.
00:21:24 Wildebeest must drink at least every
00:21:39 This is a risky time for the calf.
00:21:47 Nearby, tortoise-cam
00:21:52 of a previous visitor to the river.
00:21:59 The scavengers
00:22:03 Carcasses can remain
00:22:12 At the river's edge,
00:22:28 For the calf, danger can come
00:22:41 This is the perfect
00:22:44 The prey are facing away
00:23:15 It's chaos
00:23:18 But there are plenty
00:23:33 They panic onto the plain and,
00:23:41 One is taken.
00:23:44 Then another.
00:23:49 Two kills,
00:23:53 Mother and calf keep running.
00:23:56 They can never be sure where
00:24:18 Two carcasses
00:24:30 The cubs' births have coincided
00:24:49 But the Mara is so full of predators
00:24:52 that existing cheek by jowl with
00:25:07 If they are faced
00:25:10 lions often avoid a confrontation.
00:25:20 But these hyenas seem more intent
00:25:25 and that seems to intrigue
00:25:33 The victim is almost certainly
00:25:56 The lions can't resist
00:25:59 but it seems more
00:26:14 Without further bloodshed,
00:26:29 The weeks pass,
00:26:30 and the calf is stronger and fitter
00:26:34 But soon he must leave this
00:26:40 back into Tanzania.
00:26:49 He has survived the Mara's minefield
00:26:53 but soon, he'll have
00:27:02 His next challenge
00:27:15 Hippo-cam is spying on one
00:27:18 found along the length
00:27:25 The hippo seem to accept the strange
00:27:39 Unfortunately for the hippos,
00:27:42 where wildebeest traditionally
00:27:49 The herds are already massing
00:27:59 Motivated by a common urge, the
00:28:03 to form a giant army,
00:28:10 For the calf,
00:28:18 Hippos are noisy and intimidating,
00:28:21 especially when their
00:28:34 Undeterred,
00:28:43 The mother and calf get their first
00:28:51 But this blockade must be more
00:29:10 Hippos are notoriously unpredictable
00:29:14 and this pod
00:29:38 Even the Thompson gazelles
00:29:55 For the calf, the excitement
00:30:04 Luckily, he has second thoughts.
00:30:10 But this was just the
00:30:14 Once they seem confident,
00:30:22 The hippos' peace is shattered.
00:30:36 They don't like
00:30:47 The calf's turn arrives.
00:30:52 He takes the plunge,
00:31:10 The hippos are vanishing fast.
00:31:22 They may be out of sight
00:31:40 Their mood hasn't improved one bit.
00:32:04 They discharge dung into the water.
00:32:11 Like hidden depth charges,
00:32:38 The swimmers
00:32:46 The front-runners reach the shore,
00:32:54 Another hippo even makes a grab
00:33:00 But it escapes.
00:33:03 In the turmoil, the calf
00:33:07 He's been separated from his mother
00:33:23 The hippo's anger hasn't subsided.
00:33:30 The calf is nearly exhausted
00:33:34 This is unusual behaviour.
00:33:36 Hippos are supposed to
00:33:44 But the hippo doesn't attack.
00:33:53 Crocodiles aren't so merciful.
00:34:10 But the calf had a good head start.
00:34:18 He may have survived
00:34:24 Wildebeest are disappearing
00:34:33 The calf is separated and alone.
00:34:56 There is only one way out
00:35:07 He's back where he started
00:35:20 A band of foraging mongooses
00:35:45 Hating to be alone, lost calves
00:35:52 Others have the same idea.
00:35:57 This impala fawn
00:36:05 Like the wildebeest calf,
00:36:20 The young impala calls,
00:36:31 But then something
00:36:34 the meeting of two lost souls.
00:36:51 The calf is curious.
00:36:53 The fawn seems to think
00:37:11 Then, the fawn hears a familiar
00:37:21 This is normal behaviour.
00:37:24 Impala deliberately leave
00:37:28 when they move away to graze.
00:37:30 Wildebeest calves are conspicuous
00:37:33 and need to stay with the herd to
00:37:44 The herd also shares sentry duties.
00:37:48 Alone,
00:37:54 This mother cheetah and her
00:38:08 The calf takes the prudent option
00:38:10 but one that proves irresistible
00:38:26 He can now run like the wind.
00:38:29 The cheetahs are too slow
00:38:31 to catch up
00:38:38 Across the river, the wildebeest
00:38:46 The mother returns
00:38:58 She hesitates.
00:39:02 Then she makes a brave decision.
00:39:13 She crosses back to the other side.
00:39:58 Crossing alone
00:40:01 The crocodiles
00:40:14 The cheetahs seem game
00:40:17 even though the mother
00:40:26 The calf hears her call.
00:40:35 Once more, the two are together.
00:40:47 Another herd appears.
00:40:52 Adult wildebeest show no
00:40:57 so mothers and calves are instantly
00:41:17 At one-year-old, the cheetah's cub
00:41:22 but she still enjoys
00:41:29 The calf likes
00:42:22 Play is good practice for hunting.
00:42:25 The mood can change very quickly.
00:42:31 Nearby are the mother and her cub.
00:42:34 The Mara supports a lot of cheetahs!
00:42:44 The others spot them.
00:42:53 The tiny cub is vulnerable
00:42:55 and the pair are acting
00:43:04 The cub is nervous.
00:43:06 Such encounters are rare and it's
00:43:30 The mother sounds a warning.
00:43:36 She yelps in distress.
00:43:42 The cub runs for his life.
00:43:57 It's a stand-off
00:44:02 Neither seems to know
00:44:09 A reprieve.
00:44:15 It may be that these cheetahs
00:44:19 from the new arrival
00:44:24 Anyway,
00:44:36 The calf and his mother
00:44:37 have settled back into the herd
00:44:40 Migration happens in waves
00:44:45 For those yet to leave,
00:45:18 Because of the rich pasture,
00:45:20 around half a million wildebeest
00:45:24 at some point on their journey.
00:45:26 Back in the midst of the herd,
00:45:28 the calf relies on safety
00:45:34 Predators make daily assaults.
00:45:37 Their days of easy hunting
00:45:46 As many as six lionesses may work
00:46:03 While the grass is long,
00:46:19 The lion that has stalked closest
00:46:30 One misses,
00:46:40 She's got one.
00:46:42 It's a zebra.
00:46:44 Lions seem to prefer them
00:46:56 The productivity of the Mara
00:47:02 The mother and calf
00:47:08 The whole vast herd
00:47:42 The cub copes with the deluge
00:47:55 Although the rain
00:47:58 it also triggers mass movement.
00:48:01 The herds are leaving the Mara.
00:48:17 They mass once more
00:48:26 They have arrived at the most
00:48:54 Opposite them
00:48:57 and the water below
00:49:11 There are few more difficult
00:49:14 but year after year,
00:49:16 the wildebeest choose this place as
00:49:26 A gazelle is the first
00:49:35 She reaches the notorious wall
00:49:40 but pays the price.
00:49:55 Zebra are the next
00:49:59 And wherever they go,
00:50:14 Once the crossing is underway,
00:50:18 the herd's impulse to join in
00:50:24 The urge to migrate is so strong,
00:50:31 Mother and calf once again
00:50:41 The mother leaps, the calf follows.
00:50:58 The calf is now a strong swimmer,
00:51:03 but hundreds of wildebeest
00:51:20 In front stands
00:51:24 and still they keep coming.
00:51:46 For the calf,
00:51:52 The zebra are the first
00:52:01 They're the favourite
00:52:04 but their kick can be crippling.
00:52:19 Mother and calf
00:52:24 The crocodile finds
00:52:35 But many more crocodiles
00:52:46 The calf is singled out.
00:52:58 Missed!
00:53:06 But the danger is not over.
00:53:09 The calf and mother
00:53:14 The build-up
00:53:21 And crocodiles
00:53:43 The calf
00:53:51 Others fall.
00:53:57 He follows.
00:54:04 The crocodile tries again
00:54:07 but the calf
00:54:14 He gradually works his way
00:54:27 Yet more wildebeest are arriving.
00:54:35 They use each others' bodies
00:54:53 And still they keep coming.
00:54:59 The calf is being pushed
00:55:13 Then, suddenly, the pressure eases.
00:55:18 The bottleneck has an opening.
00:55:22 The calf finds it.
00:55:30 The pressure
00:55:38 The calf and mother make it
00:55:51 The mother tries again,
00:55:55 So near yet so far.
00:55:59 The calf slips.
00:56:03 He struggles to get up.
00:56:16 He finds his feet...
00:56:23 ..and manages to reach the top.
00:56:26 His mother is there to greet him.
00:56:42 Mother and calf have survived
00:56:45 some of the most challenging
00:56:50 They will now travel south,
00:56:52 back to the short-grass plains
00:56:58 It was here that the calf was born
00:57:01 and it was here
00:57:10 And, on these plains,
00:57:15 They too are destined
00:57:18 one that has been made
00:57:22 Undoubtedly, the greatest
00:57:25 Subtitles by Red Bee Media Ltd