Acacias communicate with each other in response to insect attack by producing a gas called ethylene.
How do acacias communicate?
When antelopes begin to eat the leaves of an acacia tree, the tree emits a signal of ethylene gas into the air through the pores of its leaves. This signal can travel up to 45 meters warning other nearby trees of the presence of herbivores. Once the signal is received, acacias begin to produce tannin in their leaves in amounts that are lethal to antelopes.
With this information, we can conclude that Acacia trees, when eaten by grazing giraffes, release ethylene gas, which prompts other acacias to flood their leaves with bitter tannins.
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