Trees can communicate in two ways, underground and overground. The underground communication is called the Wood Wide Web. The Wood Wide Web is a system of fungi interconnected with trees’ roots that helps trees communicate underground. Through the Wood Wide Web, trees can share resources and warn other trees of invaders. The overground communication occurs when trees send out a gas to warn other trees to bring tannins and toxins that make leaves unpleasant for invading bugs. Trees also recognize saliva of different bugs, so they send out pheromones to attract species that eat the bad bugs.
