托福口语 Task 4

Today, we're going to talk about a fascinating phenomenon in biology called 'mimicry.' Now, mimicry is when one species evolves to look or behave like another species, often to gain some survival advantage. But what's really interesting is that mimicry isn't always about looking like a dangerous animal to scare off predators. Sometimes, it's about tricking other species for food or reproduction. Let me give you two examples. First, consider the orchid mantis. This insect has evolved to resemble a pink and white orchid flower. It sits motionless among real flowers, and when a pollinator like a bee or butterfly approaches, thinking it's a flower, the mantis strikes and captures it. So, the mantis uses visual mimicry to attract its prey. Second, there's the bolas spider. This spider doesn't look like a flower, but it mimics the pheromones—the chemical scent—of a female moth. Male moths are attracted to this scent and fly toward the spider. When they get close, the spider swings a sticky ball on a thread, called a bolas, to catch the moth. So, here, the mimicry is chemical, not visual. Both examples show that mimicry can be a clever strategy for hunting, not just for defense.