The amount Earth's land is covered by desert.
What is one-fifth, or 20%?
This weather event can transform a desert landscape into a sea of green.
What is a cloudburst?
Animals are attracted by enormous herds or Wildebeest in the Serengeti.
About 90% of the North American prairie has been lost. Most of it was converted to this.
What is agriculture/farmland?
The Alcon blue butterfly caterpillar uses these to lower itself from its food plant toward the ground.
What are threads of silk?
We saw about 50,000 of these birds emerge from a dust storm in the Arabian desert.
What are Socotra cormorants?
Fewer than 150 of these enormous animals survive in the deserts of Namibia.
What are desert elephants?
Animals that stalk and attack other animals for food (cheetahs are this to the wildebeests).
What are predators?
This animal once roamed the Great Plains in herds numbering in the millions.
What is the American bison?
Ants begin feeding an Alcon blue caterpillar after it enters their colony.
Why do caterpillars mimic signals that the young ants use?
An adult Socotra cormorant that has food will give it to this bird.
What is its own chick?
When desert lions approach, how is the elephant calf protected.
What is protection by its mother/herd?
The environmental policy that allows the dramatic predator-prey interactions (and generally the rich wildlife interactions) in the Serengeti to continue.
What is a protected protected area?
The tall grasses of Mongolia provide a last hiding place for this highly endangered animal.
What is the greater one-horned rhinoceros?
The Alcon blue butterfly spends approximately this long inside the ant nest.
What is 23 months?
About how large is the territory of the male Arabian leopard shown in the episode?
What is 350 square kilometers?
The approximate height of the enormous bull elephant shown in the episode.
What is nearly 4 meters?
The tigress met this close to her prey before she can successfully attack.
What is 20 meters (more or less)?
This wild wild was once extinct in the wild but has been carefully bred and reintroduced.
This wild horse was once extinct in the wild but has been carefully bred and reintroduced.
This enormous sand sea, whose name means "Empty Quarter," is the largest sand sea in the world.
What is the Rub' al Khali?
The desert can actually help fertilize the sea when wind carries this into surrounding waters.
What is nutrient-rich dust?
Over the last 100 years, wild tiger numbers have declined by more than this percentage.
What is 95%?
About 180 years ago, how many bison roamed the Great Plains?
What were millions.
The Alcon blue caterpillar benefits from the ants feeding and protecting it while the ants receive little or no benefit. This is the ecological relationship between between the two species.
What is parasitism? What is parasitic relationship=