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Vast open plains. Immense spaces. Eerie silence. But any feeling of emptiness is an illusion.
The plains of our planet support the greatest gatherings of wildlife on earth.
At the heart of all that happens here is a single living thing, grass.
This miraculous plant covers a quarter of all the lands of the earth.
Grasslands exist wherever there is a little rain, but not enough to sustain the forest.
Some are huge. The Central Asian Steppe alone extends 1/3 of the way around our planet.
It's summer and eagles effortlessly cruise the thermals scanning the ground beneath for signs of prey.
In the distant reaches of Outer Mongolia one of the planet's great migrations is under way.
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