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