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