Nature is full of unique “signals” that are beyond the human hearing range. Recently, scientists have discovered that plants emit sounds when they are stressed, and these sounds have an effect on animals. Scientific research has shown that animals respond to the sounds made by plants. For example, a female mulberry moth has been known to avoid laying eggs on tomato plants when they hear sounds that indicate that they are stressed. We are talking about sounds that humans cannot hear – sounds that resemble the explosion of a firecracker.