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 a species evolves a trait that takes advantage of an existing sensory bias in another species, often for mating or survival. Let me give you two examples. First, consider the water mite. Female water mites are naturally attracted to vibrations on the water surface, which they associate with prey. Male water mites have evolved to produce vibrations that mimic those of prey, tricking females into approaching them for mating. Second, there's the example of the swordtail fish. Female swordtails have a pre-existing preference for males with a long 'sword' on their tail, likely because it makes the male more visible or resembles a food item. Over time, males in some species developed longer swords to exploit this preference, even though the sword itself might make swimming less efficient. So, sensory exploitation shows that traits can evolve not just for survival, but to hack into the existing sensory world of others.