Acharya Prashant explains that animals are very close to nature and have survived for millions of years by following natural instincts rather than complex thoughts. Through their long evolutionary history and experience, animals have developed the ability to sense a person's intentions and emotions. He notes that when a person's mental state changes—whether they are angry, disappointed, or lustful—their eyes, body language, and even body odor change. Animals can detect these physical and biological signals, much like a lie detector identifies physiological changes in a human being.