The thorny acacia trees of East Africa live in close harmony with ant colonies, and each depends on the other for health and survival - but disrupting that relationship can lead to death and danger, ...

Ants living in whistling-thorn acacia trees on the African savanna may weigh only 3 milligrams, but they can protect their trees from being demolished by elephants weighing a billion times more, ...

Ecologists have discovered the secret weapon used by certain acacia trees to defend themselves against ravenous elephants: ants. The finding could one day help conservationists protect vulnerable ...

In the 1960s, Penn biologist Dan Janzen, as part of earning his Ph.D., re-described what has become a classic example of biological mutualism: the obligate relationship between acacia-ants and ...

Acacia trees are a prominent feature of the East African savannah. They're also a classic example of the long-standing and complex relationships between plants and insects, in this case acacia ants.

Crisp lines of light begin to play out across the landscape. As the morning light grows, blades of grass take shape and, amongst rocky outcrops, green acacia breaks the yellow and gold of the savannah ...

Video: Researchers found that keeping large grazing mammals away from acacia trees caused the cosy relationship between the trees and the ants to break down If the African savannah were to lose ...