Plants have the ability to communicate and respond to external stimuli. For example, when giraffes eat acacia trees downwind, the other trees emit chemicals to make their leaves taste bad. Additionally, plants can produce toxic chemicals in response to recordings of insects eating their leaves. There is also evidence suggesting that willows send root tendrils towards the sound of running water. These responses to sound and smell are intriguing, especially considering that plants do not have noses or ears.