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