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In the far north,
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after three dark months of winter,
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a world is waiting
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00:00:55,223 --> 00:00:56,974
for a trigger.
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00:00:59,477 --> 00:01:02,146
The sunshine of spring.
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00:01:14,492 --> 00:01:18,079
Starfish are the first to respond.
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They race for the highest point,
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00:01:36,013 --> 00:01:38,182
and, sensing changes in the water,
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with the tips of their tube feet,
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they spawn.
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00:02:00,871 --> 00:02:02,581
Sea cucumbers,
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with only their mouths exposed,
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00:02:05,876 --> 00:02:07,545
now emerge.
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00:02:18,222 --> 00:02:21,892
They collect as many
starfish eggs as they can.
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00:02:36,490 --> 00:02:40,411
Which is quite a lot
when you've got ten arms.
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00:02:52,089 --> 00:02:53,799
Now sea pens
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00:02:53,924 --> 00:02:55,968
rise up to claim a share.
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The creatures here
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00:03:08,189 --> 00:03:11,776
must grab what they can
of this annual banquet.
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00:03:16,614 --> 00:03:19,116
For the light has also set in motion,
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the greatest transformation of all.
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00:03:26,207 --> 00:03:27,625
Fronds of kelp,
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00:03:27,792 --> 00:03:30,795
a marine alga, rise towards the surface,
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lifted by their gas-filled bladders.
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Soon, a marine forest has materialised.
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Teeming with life of all kinds,
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these green seas
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00:04:05,496 --> 00:04:09,750
are some of the most productive
but fiercely competitive waters
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00:04:09,917 --> 00:04:11,544
in all the oceans.
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00:04:30,521 --> 00:04:32,857
The southern tip of Africa.
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00:04:35,776 --> 00:04:39,238
Here two great oceans collide.
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In the shallows,
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fed by rich currents,
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00:04:55,546 --> 00:04:58,466
are bountiful forests of kelp.
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Barely visible, except for
the pulsating siphons
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through which it breathes,
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a common octopus waiting for prey
to pass by.
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A crab will do.
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00:05:36,962 --> 00:05:39,340
The octopus sets off in pursuit.
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00:06:12,540 --> 00:06:14,291
And then lurks
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00:06:15,793 --> 00:06:18,212
with the patience of an ambush hunter.
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00:06:44,989 --> 00:06:48,075
But the octopus shares the Cape waters
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00:06:48,325 --> 00:06:51,412
with a great concentration
of other predators.
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Fur seals,
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00:07:02,840 --> 00:07:04,008
and sharks.
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00:07:08,512 --> 00:07:10,055
They all eat octopus,
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if they can find one.
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00:07:22,776 --> 00:07:25,237
And Pyjama Sharks are experts
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00:07:27,906 --> 00:07:29,908
at hunting in the undergrowth.
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Time to disappear.
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00:07:48,052 --> 00:07:50,346
But these tough-skinned little sharks
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00:07:50,429 --> 00:07:54,058
are small enough to reach deep
into crevices.
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00:08:14,411 --> 00:08:16,997
But the octopus is far from finished.
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00:08:20,626 --> 00:08:24,171
She slips her tentacles
into the shark's gills.
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00:08:25,589 --> 00:08:28,175
That prevents the shark from breathing.
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00:08:32,471 --> 00:08:34,973
So the shark has to let go.
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00:08:47,111 --> 00:08:50,447
When caught out
in the open and vulnerable,
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00:08:50,614 --> 00:08:54,660
this octopus does something
truly extraordinary,
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00:08:55,994 --> 00:08:58,372
and never recorded before.
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00:09:09,550 --> 00:09:11,510
She disguises herself
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with a protective armour of shells.
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She's hiding
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00:09:24,690 --> 00:09:26,483
in plain sight.
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00:09:37,703 --> 00:09:39,997
The shark can sense its prey.
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But the shells confuse it.
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00:10:04,062 --> 00:10:06,857
In a forest full of hungry mouths,
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superior wits allow this octopus
to stay alive.
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00:10:23,874 --> 00:10:25,709
Forests of kelp
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flourish in seasonal waters
around the globe,
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00:10:33,467 --> 00:10:37,262
particularly along the Pacific Coast
of North America.
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00:10:46,230 --> 00:10:48,482
Here, the biggest kelps of all
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00:10:48,607 --> 00:10:50,734
grow in vast forests,
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stretching for hundreds of miles.
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00:10:59,326 --> 00:11:00,744
In some places,
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the giant fronds rise up
to 60 metres tall.
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00:11:11,839 --> 00:11:13,674
The thickets they create
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00:11:13,924 --> 00:11:15,592
are crowded with life.
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00:11:24,268 --> 00:11:27,938
Competition here for space and food
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is intense.
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00:11:43,453 --> 00:11:45,038
A challenging problem
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00:11:45,455 --> 00:11:47,624
for the Garibaldi fish.
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00:11:54,506 --> 00:11:57,301
He tends to his patch of seaweed
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00:11:57,551 --> 00:12:00,178
filled with tiny creatures that he eats.
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00:12:10,063 --> 00:12:11,857
As with most farmers,
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00:12:12,232 --> 00:12:14,151
his work never ends.
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00:12:19,489 --> 00:12:22,826
He removes snails and any other grazers
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that come to eat his algae.
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No matter how big they are.
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00:12:57,361 --> 00:13:01,031
He has to deal with pests of all kinds.
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00:13:04,368 --> 00:13:06,453
This can be the worst of them.
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00:13:06,703 --> 00:13:11,917
Sea urchins that can scrape off
every vestige of algae from a rock.
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00:13:13,210 --> 00:13:15,462
Its spines are needle sharp.
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00:13:18,882 --> 00:13:21,885
Somehow the Garibaldi must remove it.
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00:13:35,899 --> 00:13:38,568
But the problem with sea urchins
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00:13:44,074 --> 00:13:46,493
is that they just keep coming.
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00:14:02,634 --> 00:14:05,679
When evening arrives
and the light fades,
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00:14:05,804 --> 00:14:09,599
he has to stop.
He not only needs a rest,
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00:14:09,683 --> 00:14:11,601
he needs to hide.
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00:14:16,356 --> 00:14:18,025
Because at night,
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00:14:18,275 --> 00:14:21,278
predators prowl through these forests.
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00:14:25,949 --> 00:14:27,492
A Torpedo Ray,
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capable of stunning its victim
with 45 volts of electricity.
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00:14:45,135 --> 00:14:47,304
While the Garibaldi hides,
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00:14:48,805 --> 00:14:51,975
the urchins can feed
without interruption.
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00:15:01,568 --> 00:15:03,653
The light returns,
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00:15:08,075 --> 00:15:11,036
and he finds his farm is once again
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00:15:11,161 --> 00:15:12,496
under attack.
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00:15:28,929 --> 00:15:31,223
Urchins like locusts,
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00:15:31,681 --> 00:15:34,017
have the ability to swarm
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00:15:41,399 --> 00:15:43,944
and this can be disastrous
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00:15:44,069 --> 00:15:45,695
not just for the Garibaldi,
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00:15:45,862 --> 00:15:48,031
but for the kelp forest itself
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00:16:01,753 --> 00:16:05,048
All the vegetation is now under attack.
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00:16:35,620 --> 00:16:38,248
The urchins move through the forest
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00:16:38,415 --> 00:16:40,584
cutting through the kelp fronds
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00:16:40,750 --> 00:16:44,254
and leaving behind vast barrens.
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00:16:47,924 --> 00:16:49,467
These urchin armies
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00:16:49,593 --> 00:16:51,761
have felled many kelp forests
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00:16:51,928 --> 00:16:54,764
along the Pacific Coast
of North America.
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00:17:02,355 --> 00:17:04,774
But help is at hand.
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Sea otters.
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All other kinds of otters spend much
of their lives on land.
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00:17:37,307 --> 00:17:40,018
But sea otters rarely leave the water.
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00:17:43,730 --> 00:17:46,066
At first, a newly born pup
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is not a very good swimmer.
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00:17:48,485 --> 00:17:50,570
So its mother spends hours
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00:17:50,654 --> 00:17:53,406
grooming its fur to make it buoyant.
128
00:18:00,497 --> 00:18:03,041
But to provide her youngster with milk,
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00:18:03,166 --> 00:18:04,751
and keep herself warm
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00:18:04,918 --> 00:18:09,506
she must eat up to 30%
of her bodyweight every day.
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00:18:29,526 --> 00:18:32,862
She does that by eating shellfish.
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00:18:37,951 --> 00:18:42,914
And urchins are among a sea otter's
favourite delicacies.
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00:19:02,100 --> 00:19:06,813
In the past, sea otters were hunted
so intensively for their fur,
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00:19:06,938 --> 00:19:09,274
that they came close to extinction.
135
00:19:14,487 --> 00:19:15,905
With them gone,
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00:19:16,156 --> 00:19:19,409
many kelp forests were replaced with
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00:19:19,576 --> 00:19:21,494
urchin barrens.
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00:19:31,588 --> 00:19:34,591
Today, sea otters are protected.
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00:19:37,594 --> 00:19:40,013
And as their numbers slowly return,
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00:19:40,472 --> 00:19:43,933
many of the kelp forests
are recovering too.
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00:20:00,658 --> 00:20:02,911
Now, in some remote places,
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00:20:02,994 --> 00:20:04,788
sea otters are so numerous,
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00:20:04,871 --> 00:20:07,874
they assemble in huge wafts.
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00:20:13,046 --> 00:20:15,006
Something that hasn't been seen
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00:20:15,131 --> 00:20:17,050
for over a century.
146
00:21:01,344 --> 00:21:04,389
In the sun drenched
shallows off Australia,
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00:21:05,515 --> 00:21:09,686
kelp is replaced by the sea's
only flowering plants,
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sea grass.
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00:21:21,573 --> 00:21:24,909
The most extensive of these marine
grasslands
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00:21:25,535 --> 00:21:29,205
can stretch for over 3,000 square miles.
151
00:21:42,969 --> 00:21:44,596
All across the Tropics,
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00:21:44,888 --> 00:21:47,724
they're patrolled by tiger sharks.
153
00:21:52,896 --> 00:21:55,899
They can grow
up to five metres in length.
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00:22:02,614 --> 00:22:05,241
And have powerful crushing jaws.
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00:22:14,334 --> 00:22:17,170
Green turtles are their prey.
156
00:22:22,467 --> 00:22:26,346
The turtles feed almost entirely
on sea grass.
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00:22:28,306 --> 00:22:33,520
A single one can consume
up to two kilos of it in a day.
158
00:22:50,954 --> 00:22:52,622
But they can never rest easy.
159
00:23:03,883 --> 00:23:08,638
Healthy turtles will keep well away
from an approaching shark.
160
00:23:23,987 --> 00:23:26,823
And just by keeping the turtles
on the move,
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00:23:27,323 --> 00:23:30,410
the sharks prevent
any one patch of sea grass
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00:23:30,577 --> 00:23:32,370
from being overgrazed.
163
00:23:38,334 --> 00:23:41,254
And that has benefits for us all.
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00:23:50,263 --> 00:23:51,931
A patch of sea grass
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can absorb and store
35 times as much carbon dioxide
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00:23:57,770 --> 00:24:00,773
as the same area of a rainforest.
167
00:24:06,738 --> 00:24:09,115
So the prairies and their sharks
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00:24:09,282 --> 00:24:11,868
are surprising allies in the fight
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00:24:11,951 --> 00:24:14,037
against a warming climate.
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00:24:24,297 --> 00:24:27,091
The struggle to survive
in our green seas
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00:24:27,383 --> 00:24:29,761
can have far reaching consequences.
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00:24:32,138 --> 00:24:33,222
Once a year,
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one particular meadow in Australia,
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is transformed.
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Around the first full moon of winter,
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an army materialises.
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Spider crabs.
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00:25:06,172 --> 00:25:09,676
For the past year
they've been feeding in deeper waters.
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00:25:20,770 --> 00:25:24,524
Now, they march across
the sea grass plains.
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00:25:43,793 --> 00:25:46,462
Hundreds of thousands of them.
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They clamber over one another
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creating great mounds
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nearly a hundred metres long.
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00:26:18,828 --> 00:26:20,538
They're not seeking mates
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neither are they laying eggs.
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00:26:24,000 --> 00:26:26,002
They have come here in order
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00:26:26,711 --> 00:26:28,004
to grow.
188
00:26:31,174 --> 00:26:35,178
Like all crabs, their bodies
are enclosed in a hard
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00:26:35,261 --> 00:26:37,013
unexpandable shell.
190
00:26:39,724 --> 00:26:43,019
So to grow,
they have to break out of it.
191
00:26:53,696 --> 00:26:58,075
And that allows the soft one
that has developed beneath
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00:26:58,242 --> 00:26:59,535
to expand.
193
00:27:07,919 --> 00:27:11,380
It will take days
for the new shell to harden.
194
00:27:24,060 --> 00:27:25,812
Its legs are so limp,
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00:27:26,062 --> 00:27:27,939
that they won't work properly.
196
00:27:31,901 --> 00:27:33,778
The crab is unprotected
197
00:27:34,237 --> 00:27:35,947
and in great danger.
198
00:27:45,456 --> 00:27:47,917
A smooth stingray.
199
00:27:51,170 --> 00:27:53,840
It's huge, about four metres long.
200
00:27:56,926 --> 00:27:59,846
It wants a soft, freshly moulted crab
201
00:28:00,429 --> 00:28:02,098
that will be easier to eat.
202
00:28:24,704 --> 00:28:26,539
The crabs try to stick together.
203
00:28:35,798 --> 00:28:38,134
But now, disturbed by the ray,
204
00:28:38,342 --> 00:28:39,510
they're scattering.
205
00:28:45,975 --> 00:28:47,560
A newly moulted crab
206
00:28:48,811 --> 00:28:51,355
is too weak to keep up with the crowd.
207
00:29:06,579 --> 00:29:10,416
The safest place is right
in the middle of the pile.
208
00:29:11,834 --> 00:29:15,046
That is why they have
all assembled here.
209
00:29:24,555 --> 00:29:27,183
There is safety in numbers.
210
00:29:43,366 --> 00:29:46,243
But the vast majority
of the crabs escape.
211
00:29:47,536 --> 00:29:49,413
And within the next few days,
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00:29:49,580 --> 00:29:52,208
they will be ready to return
to the depths,
213
00:29:52,375 --> 00:29:54,877
and resume their lonely wanderings
214
00:29:55,044 --> 00:29:56,545
in search of food.
215
00:30:09,475 --> 00:30:11,727
This is no graveyard.
216
00:30:14,480 --> 00:30:17,775
But the triumph
of a hundred thousand crabs,
217
00:30:18,734 --> 00:30:20,152
successfully moulted.
218
00:30:46,095 --> 00:30:49,181
The green seas of Southern Australia,
219
00:30:49,348 --> 00:30:53,436
are particularly rich in such
spectacular assemblies.
220
00:30:57,440 --> 00:31:02,153
But most of the creatures come together
for a very different reason,
221
00:31:04,321 --> 00:31:05,614
to breed.
222
00:31:10,036 --> 00:31:11,704
The giant cuttlefish.
223
00:31:13,164 --> 00:31:15,291
The largest of all cuttlefish.
224
00:31:23,132 --> 00:31:25,968
They live for just one or two years.
225
00:31:32,349 --> 00:31:35,644
Now, as the Australian summer
draws to an end,
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00:31:36,353 --> 00:31:39,148
they have one last act to complete.
227
00:31:43,486 --> 00:31:45,029
To find a mate.
228
00:31:50,326 --> 00:31:53,245
But there are
over one hundred thousand males
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00:31:54,038 --> 00:31:56,624
competing for the arriving females
230
00:31:56,707 --> 00:31:58,167
in this one bay.
231
00:32:04,757 --> 00:32:07,927
Among them, a giant, a true goliath.
232
00:32:08,552 --> 00:32:11,263
He probably weighs about ten kilos.
233
00:32:15,101 --> 00:32:17,895
Bands of colour sweep across his skin.
234
00:32:18,562 --> 00:32:20,689
That's how cuttlefish communicate.
235
00:32:41,377 --> 00:32:45,089
This smaller male couldn't
possibly take him on.
236
00:32:55,141 --> 00:32:58,060
Beside Goliath and under his protection,
237
00:32:58,561 --> 00:33:01,230
a female who has just mated with him.
238
00:33:04,775 --> 00:33:08,070
But other rivals are still interested.
239
00:33:11,991 --> 00:33:15,411
It seems a small male
wouldn't stand a chance.
240
00:33:17,746 --> 00:33:20,583
The female is now displaying
a white stripe
241
00:33:20,666 --> 00:33:23,294
along her side nearest Goliath.
242
00:33:26,672 --> 00:33:30,342
It's a clear signal that she no longer
wants to mate with him.
243
00:33:35,931 --> 00:33:39,518
It's all the encouragement
that the little male needs.
244
00:34:03,626 --> 00:34:05,961
He's going to have to use trickery.
245
00:34:21,477 --> 00:34:23,812
He tones down his colours,
246
00:34:24,647 --> 00:34:27,191
and tucks in his arms.
247
00:34:29,026 --> 00:34:32,655
He's just the right size to mimic
a female.
248
00:34:44,375 --> 00:34:46,669
Goliath is deceived.
249
00:34:49,505 --> 00:34:53,050
The small male now
displays a white stripe,
250
00:34:53,175 --> 00:34:54,760
Just like the real female
251
00:34:55,094 --> 00:34:57,012
to deter his advances.
252
00:35:03,560 --> 00:35:05,604
He slips beside her.
253
00:35:08,857 --> 00:35:10,025
And they mate.
254
00:35:21,870 --> 00:35:24,540
By mating with multiple partners,
255
00:35:25,958 --> 00:35:29,712
the female ensures
the greatest genetic diversity
256
00:35:30,045 --> 00:35:31,255
for her young.
257
00:35:37,386 --> 00:35:39,388
The sneaky male leaves,
258
00:35:40,806 --> 00:35:42,975
his final act complete.
259
00:35:48,397 --> 00:35:51,900
So even among giant cuttlefish,
it seems,
260
00:35:54,570 --> 00:35:57,156
it's not all about size.
261
00:36:07,750 --> 00:36:11,503
Other males
in these Australian green pastures,
262
00:36:12,254 --> 00:36:15,674
take greater responsibility
for their young.
263
00:36:25,184 --> 00:36:27,686
A Weedy Sea Dragon.
264
00:36:34,777 --> 00:36:36,195
This is a male
265
00:36:36,487 --> 00:36:39,281
and he's carrying a precious cargo.
266
00:36:41,617 --> 00:36:43,452
While mating with the female,
267
00:36:43,660 --> 00:36:45,287
he collected the eggs
268
00:36:45,454 --> 00:36:47,623
and attached them to his underside.
269
00:36:54,213 --> 00:36:57,466
Now, he's leaving the seaweed thickets
270
00:37:00,344 --> 00:37:02,971
and travelling into more open waters
271
00:37:03,138 --> 00:37:06,058
where elaborate camouflage
is less effective.
272
00:37:15,067 --> 00:37:17,653
And there are many predators out here.
273
00:37:40,676 --> 00:37:44,513
And this is what the fathers
risk their lives for.
274
00:37:53,522 --> 00:37:56,525
Dense clouds of minute shrimp.
275
00:38:00,779 --> 00:38:02,197
Mysids.
276
00:38:03,699 --> 00:38:06,577
One of a sea dragon's favourite foods.
277
00:38:17,629 --> 00:38:20,382
They're drawing other sea dragons
out here too.
278
00:38:44,740 --> 00:38:48,619
Finally, it's time for the young
to break free.
279
00:38:49,912 --> 00:38:53,665
But algae has grown over
these developing eggs.
280
00:38:55,459 --> 00:38:57,586
And it risks smothering them.
281
00:39:02,633 --> 00:39:05,636
Nonetheless, the babies are emerging.
282
00:39:16,939 --> 00:39:19,024
They've hatched successfully.
283
00:39:30,827 --> 00:39:33,830
The fathers return to the tangle of kelp
284
00:39:34,164 --> 00:39:36,208
where they're virtually invisible.
285
00:39:42,798 --> 00:39:45,300
While the young remain out here.
286
00:39:49,638 --> 00:39:51,515
But they will grow quickly,
287
00:39:52,808 --> 00:39:55,811
surrounded as they are
by their ideal food.
288
00:40:06,822 --> 00:40:09,700
Vast numbers of the ocean's young fish,
289
00:40:10,158 --> 00:40:13,161
start their lives in the green seas.
290
00:40:19,334 --> 00:40:24,756
One of the richest nurseries of all,
are the mangrove forests.
291
00:40:30,012 --> 00:40:32,514
Fringing the coastline of the Tropics,
292
00:40:33,348 --> 00:40:37,394
they form a natural protective barrier
between land and sea,
293
00:40:39,521 --> 00:40:42,899
and are some of the world's most
productive forests.
294
00:40:56,705 --> 00:41:00,042
Below the water,
their arching aerial roots
295
00:41:00,125 --> 00:41:01,752
give them a firm footing.
296
00:41:13,639 --> 00:41:16,892
Here there's abundant food
for baby fish.
297
00:41:22,397 --> 00:41:25,984
While the tangled roots protect them
from bigger fish,
298
00:41:26,234 --> 00:41:29,404
and other predators that haunt
the channels.
299
00:42:01,978 --> 00:42:03,855
But in Northern Australia
300
00:42:05,107 --> 00:42:07,192
with the receding tide,
301
00:42:09,027 --> 00:42:13,156
the little fish are forced
to leave their shelter.
302
00:42:18,620 --> 00:42:20,997
And now, they're vulnerable.
303
00:43:08,170 --> 00:43:12,215
It's the most deadly assassin
in the green seas.
304
00:43:20,515 --> 00:43:22,851
The Zebra Mantis Shrimp.
305
00:43:23,852 --> 00:43:26,938
A male, almost 40 centimetres long.
306
00:43:45,207 --> 00:43:47,959
But he's not hunting just for himself
307
00:43:53,882 --> 00:43:56,885
He's collecting food for his mate.
308
00:43:58,804 --> 00:44:02,557
She may have been his partner
for 20 years.
309
00:44:10,899 --> 00:44:13,819
She relies on him to bring her food.
310
00:44:16,571 --> 00:44:20,158
And puts her energy
into her eggs instead.
311
00:44:25,163 --> 00:44:27,249
In a world so full of food,
312
00:44:27,415 --> 00:44:29,835
this would seem a sensible strategy.
313
00:44:38,134 --> 00:44:40,262
But it's also a risky one.
314
00:45:07,038 --> 00:45:10,834
Were her male to disappear,
she could starve.
315
00:45:19,509 --> 00:45:22,637
Something has caught
this male's attention.
316
00:45:25,640 --> 00:45:28,143
Perhaps an irresistible odour
317
00:45:29,811 --> 00:45:31,521
or a distant call.
318
00:45:34,816 --> 00:45:38,987
Whatever the reason,
a male will leave his burrow
319
00:45:40,030 --> 00:45:42,157
and his lifelong mate.
320
00:45:51,333 --> 00:45:53,251
An even larger hole.
321
00:46:06,056 --> 00:46:08,433
Females who have lost their mates
322
00:46:08,600 --> 00:46:11,102
appear to send out distress signals
323
00:46:11,269 --> 00:46:13,605
to call in a new male.
324
00:46:19,694 --> 00:46:22,364
A larger female will produce more eggs.
325
00:46:22,697 --> 00:46:24,532
So by mating with her,
326
00:46:25,200 --> 00:46:27,369
he will father more offspring.
327
00:46:33,041 --> 00:46:36,378
But infidelity comes at a price.
328
00:46:40,215 --> 00:46:43,969
A larger partner demands more food.
329
00:46:59,234 --> 00:47:02,821
The richer a sea,
the greater the competition.
330
00:47:04,239 --> 00:47:06,491
And there is one green sea
331
00:47:06,741 --> 00:47:10,745
that supports more life
than all the rest combined.
332
00:47:13,915 --> 00:47:17,252
Unlike the mangrove forests
and the sea grass prairies,
333
00:47:17,460 --> 00:47:20,422
its location is in the open seas,
334
00:47:20,588 --> 00:47:23,758
and only temporary and unpredictable.
335
00:47:29,014 --> 00:47:32,767
This greenness comes
not from rooted plants,
336
00:47:35,770 --> 00:47:38,273
but from clouds of floating ones.
337
00:47:48,700 --> 00:47:51,828
Billions of microscopic phytoplankton
338
00:47:52,287 --> 00:47:53,788
are proliferating.
339
00:47:59,711 --> 00:48:01,379
And in such numbers,
340
00:48:01,504 --> 00:48:05,967
that they fuel one
of the greatest feasts of all.
341
00:48:15,143 --> 00:48:17,353
Off America's Pacific Coast,
342
00:48:18,354 --> 00:48:22,942
hundreds of common dolphins
are rushing to a banquet.
343
00:48:32,994 --> 00:48:35,163
They're not the only ones homing in.
344
00:48:38,500 --> 00:48:40,418
So are sea lions.
345
00:48:46,257 --> 00:48:49,677
They're heading
for Monterey Bay, California,
346
00:48:51,054 --> 00:48:54,766
where algal blooms have caused
an explosion,
347
00:48:55,725 --> 00:48:57,685
in plankton feeders.
348
00:49:00,563 --> 00:49:01,856
Anchovies,
349
00:49:02,565 --> 00:49:03,942
millions of them.
350
00:49:11,116 --> 00:49:14,244
The dolphins herd the anchovies
towards the surface.
351
00:49:18,039 --> 00:49:22,544
Sea birds and sea lions
take advantage of the shoals appearance.
352
00:49:27,882 --> 00:49:30,969
It's a race to grab a share
before others arrive.
353
00:49:51,781 --> 00:49:53,116
Hump Back Whales,
354
00:49:55,577 --> 00:49:56,911
hundreds of them.
355
00:50:07,589 --> 00:50:13,428
With every upward lunge, they sieve
out up to a 100 kilos offish.
356
00:50:31,196 --> 00:50:36,451
They're claiming the biggest share
of one of the biggest feasts on earth.
357
00:51:07,482 --> 00:51:09,984
So crucial are these tiny plankton,
358
00:51:10,360 --> 00:51:14,489
that almost all marine life ultimately
depends upon them.
359
00:51:25,667 --> 00:51:29,379
It's the green seas, not the blue
360
00:51:31,005 --> 00:51:33,841
that are the basis of almost all life
361
00:51:34,342 --> 00:51:36,386
in the world's oceans.
362
00:52:13,548 --> 00:52:16,009
Next time on Blue Planet II,
363
00:52:16,092 --> 00:52:20,096
we meet the creatures
that live where two worlds collide.
364
00:52:22,724 --> 00:52:28,146
And discover how they cope with the
demands of the ever-changing coasts.
26565
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