The swollen thorns of this Panamanian Acacia tree house a colony of fierce Pseudomyrmex spinicola ants. Chiriqui, Panama
Swollen-thorn Acacia trees in the undergrowth of a Panamanian forest. The ground beneath the trees is maintained free of weeds by ants that inhabit the thorns. Chiriqui, Panama
Swollen-thorn Acacia trees, native to Central America, are protected by fierce colonies of stinging ants. Chiriqui, Panama
