Narrator: Female Asses are mysterious creatures. They come and go as they please, and much of their behaviour seems unfathomable to an outsider.
Narrator: Flooded, burned, baked and frozen, grass can withstand it all.
Narrator: Vast open plains. Immense spaces. Eerie silence. But any feeling of emptiness is an illusion.
Narrator: 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 a forest. Some are huge. The Central Asian Steppe alone extends one third of the way around our planet.