They have thorns
Ants protect them
They have toxic chemicals
A combination of the above defenses
Different temperatures
Rain shadows
Bajadas
Midlatitudes
The savanna gets a fair amount of rain, at least 20 inches a year.
They all migrate in different directions
They eat different foods
Their territories don't overlap
They avoid each other as much as possible
Grassland
Desert
Tundra
Temperate forest
Winter and summer
Winter and fall
Spring and summer
Dry and wet
North America
Antarctica
Australia
Asia
All of the above
Having deep roots
Growing quickly
Developing fire-resistant cover