11/03/2026
Acacia trees dot the Tanzanian savanna in several varieties and in some areas grow in dense pockets. But I love when I can spot one all by its lonesome.
These trees have a chemical warning system that activate when they are browsed by herbivores like giraffes. Acacias release toxic tannins into their leaves to make them unpalatable and emit ethylene gas. Neighboring trees receive this gas signal over 150 feet away and bump up their own tannin levels within 15 minutes. Cooperative intelligence.