托福口语 Task 4

Today, we're going to talk about a fascinating concept in biology called 'mimicry'—specifically, how some animals use mimicry not just for camouflage, but for active deception. Now, the main point I want to emphasize is that mimicry can be a highly specialized survival strategy, where an animal evolves to imitate a specific model—another species or object—to gain a clear advantage, such as escaping predators or catching prey. Let me give you two examples. First, consider the orchid mantis. This insect has evolved to resemble a pink orchid flower. It doesn't just hide; it actively attracts pollinators like bees, which mistake it for a flower. When a bee lands on it, the mantis grabs it and eats it. So, here, mimicry serves as a hunting tool. Second, think of the monarch butterfly caterpillar, which feeds on milkweed and becomes toxic. The viceroy butterfly, which is not toxic, has evolved to look almost identical to the monarch. Because predators have learned to avoid the monarch's bright orange and black pattern, they also avoid the viceroy. This is a classic case of Batesian mimicry, where a harmless species imitates a dangerous one for protection. So, in both cases, the mimicry is not passive; it directly helps the animal survive—either by getting food or avoiding being eaten.