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