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