Аудирование TOEFL

🎧 Транскрипт аудио

Listen to part of a lecture in a biology class. The professor is discussing animal communication. Professor: Today we're going to talk about a fascinating aspect of animal behavior: communication. Many animals use visual signals, like the bright colors of a peacock's tail, to attract mates or warn predators. But some species have developed more complex systems. Take bees, for example. When a honeybee forager finds a rich source of nectar, she returns to the hive and performs what's called a 'waggle dance.' The dance communicates the direction and distance of the food source relative to the sun. The angle of the dance relative to vertical indicates the direction, and the duration of the waggle run indicates the distance. Interestingly, research has shown that bees can adjust their dance based on the quality of the food. If the nectar is particularly sweet, the dance is more vigorous, which encourages more bees to follow. This shows that bee communication isn't just a simple signal but a flexible system that conveys nuanced information. Now, how does this compare to other insects, like ants? Well, ants primarily use chemical signals, or pheromones, to mark trails. This is effective, but it lacks the dynamic, real-time adjustments seen in bee dances.