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