Nghe TOEFL

🎧 Bản ghi âm

Listen to part of a lecture in a biology class. The professor is discussing animal communication. Professor: Now, we often think of communication as something that requires sound, but many animals rely on visual signals. Take the cuttlefish, for example. This marine creature can change the color and texture of its skin in milliseconds. This isn’t just for camouflage; it’s also a sophisticated language. For instance, a male cuttlefish might display a bold stripe pattern to intimidate rivals, but when a female approaches, it can switch to a mottled pattern to avoid aggression. Interestingly, researchers have found that cuttlefish also use polarized light, which is invisible to most predators, as a private channel of communication. This allows them to signal to each other without being detected. So, visual communication isn’t limited to what we can see; it can involve signals beyond our perception. This challenges our assumption that sound is the most common or effective way to convey information in the animal kingdom.