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00:50:53
Sigourney Weaver, David Attenborough
25
The guanaco make the most of the dew
Dromedaries, single-humped camels, take these storms in their stride.
a camel at a waterhole can drink as much as 200 liters during a single visit.
After a rainstorm the saguaro's long shallow root system sucks up the water
These crevice in South Africa contain the highest density of lizards in the world.
the giant saguaro, one of the biggest of all cacti,
These outcrop are standing in Egypt's White Desert.
and the pleat on its trunk enable it to expand rapidly.
and the oryx know it.
The sandy riverbed acts like a giant strip of blotting paper
Sandstorms like these appear without warning
These are Nubian ibex
the temperature in midwinter can drop to minus 40,
A sudden flush of vegetation is what every desert dweller waits for,
so the kangaroos dig away the warmed topsoil
But now, with mouthful of snow lying everywhere
His rank earns him the loyalty of a harem of females
that moisture loving lichen are able to grow on the cacti
But every square meter of soil moisten by this river
and they flaunt their multi-colored bellies in territorial disputes.
and, as the saliva evaporate, their blood is cooled.
What little food exists is so disperse
Now lumps of heavily erode rocks have been marooned in a sea of sand.
Dromedaries, single-hump camels, take these storms in their stride.
In the full sun the temperature on the ground soar to 70 degrees.
Before long the cacti are drip with dew.
and they absorb liquid like a sponge.
Now lumps of heavily eroded rocks have been maroon in a sea of sand.
and that problem dominate the lives of all desert dwellers.
So they lick saliva on to their forearms
strange formations are expose in the naked rock.
Grains, swept up the flanks, are blown off the crests of the ridges
so they pile the sand into dunes.
the saguaros bloom at night to attract visitors.
but this herd concentrate on digging up the roots,
And when groups merge,
They're being inexorably chiseled away
As they're forced upwards
Amazingly, lions live here, too.
When competitors are evenly matched as they are here,
ancient rivers flowing across sandstone country steadily widen their canyons
but they nonetheless need a regular supply of water.
The blasting sand will eventually eliminate them altogether.
but surprisingly none are.
But moisture, lost even at night, has to be replaced sometime somehow
Further inland the air remains so warm that its moisture does not condense
The relentless power of the wind ensures that the face of a desert is continually changing.
Waterholes are filled temporarily.
that responds as quickly and as dramatically to the good times as the desert locust.
and a whole swarm can consume literally hundreds of tons of vegetation.
to get at the cooler ground beneath.
Now lumps of heavily eroded rocks have been marooned in a sea of sand.
It's rarely seen on this scale
In all of them life manages somehow
so Bactrian camels eat it.
The extraordinary ears of the fennec foxes of Africa radiate heat
From a summer high of 50 degrees centigrade
In one day each of these acrobatic little lizards may catch 50 flies.
Reptiles have armored scaly skins that protect them from the stinging grains.
attract long-nosed and long-tongued bats.
The extraordinary ears of the fennec foxes of Africa radiate heat
These are Nubian ibex
appear to be lifeless,
Australia is the world's most arid continent with blistering daytime temperatures.
Reptiles have armored scaly skins that protect them from the stinging grains.
The ferocious wind, armed with grains of sand,
Toads have permeable skins
In this heat the effort is truly exhausting.
to keep a precarious hold.
attract long-nosed and long-tongued bats.
But it is infrequent
These jagged pyramids a hundred meters tall