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