托福口语 Task 4

Today we're going to talk about a fascinating behavior in the animal kingdom called 'mimicry.' Now, mimicry isn't just about looking like another animal for camouflage—it can also involve sounds or actions to deceive predators or prey. One key point I want to emphasize is that mimicry often evolves as a survival strategy, and it can be either visual or behavioral. Let me give you two examples. First, consider the monarch butterfly and the viceroy butterfly. Monarchs are toxic to birds because they eat milkweed, which contains toxins. Birds learn to avoid them. The viceroy, however, is not toxic, but it has evolved to look almost identical to the monarch. This visual mimicry protects the viceroy because birds mistake it for the toxic monarch and leave it alone. My second example is the mockingbird. Mockingbirds don't mimic visually; instead, they imitate the calls of other bird species. This behavioral mimicry can confuse other birds, making them think a predator is nearby, so they flee, leaving food sources or territory for the mockingbird. So, you see, mimicry can take different forms but serves a similar purpose—enhancing survival.