托福口语 Task 4

Today, we're going to talk about a fascinating concept in animal behavior called 'sensory exploitation.' This is when animals evolve traits that exploit the pre-existing sensory biases of other animals, often to gain a reproductive advantage. Let me give you two examples. First, consider the male túngara frog. Females are naturally attracted to the 'whine' sound, which is a basic call. But males add a 'chuck' at the end. This 'chuck' exploits the female's auditory system, which is already sensitive to low-frequency sounds because of predators. The extra sound makes the male more attractive, even though it also increases the risk of attracting predators. Second, look at the water mite. Males of this species perform a waving motion near females. Females have a pre-existing sensitivity to vibrations caused by their prey, copepods. The male's waving mimics those vibrations, so the female mistakes him for food and approaches, allowing the male to mate. In both cases, the males have evolved to tap into what females already detect naturally.