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Arcadia trees, which grow all over the African savannah, have a unique defense system. When animals like antelopes start to gobble up its leaves, the tree increases tannin production to levels that are toxic to animals.
The acacia trees that were being eaten gave off a warning gas (specifically, ethylene) that signalled to neighbouring trees of the same species that a crisis was at hand. Right away, all the forewarned trees also pumped toxins into their leaves to prepare themselves
