The archetypical tree of the Serengeti is undoubtedly the Aciacia (Acacia drepanolobium)
"Acacias are often referred to as thorn trees. Some have long straight thorns while others have hook-shaped ones. The main reason is that it acts as a deterrent against browsers. Scientists have said that despite the thorns, some herbivores still feed on the trees. Not preventing feeding, but indeed limiting over-grazing. One interesting fact is that when browsed on by, for example giraffes, some acacia trees release a toxin known as tannin. This makes the leaves inedible and causes the animal to seek ‘greener pastures’. The toxin can be quite dangerous to the animals if ingested and can be lethal."
Source: Tanzania Experience
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