托福口语 Task 4

Today, we're going to talk about a fascinating concept in biology called 'mimicry.' Specifically, I want to focus on how some animals use mimicry not just for camouflage, but as a clever defense strategy. The main point is that mimicry can be a highly effective way for prey to avoid predators. Let me give you two examples. First, consider the monarch butterfly. Its bright orange and black patterns signal to birds that it's toxic—birds learn to avoid it. Now, there's another butterfly, the viceroy, which is not toxic at all. However, it has evolved to look almost identical to the monarch. By resembling the toxic monarch, the viceroy fools birds into thinking it's also dangerous, so they leave it alone. This is called Batesian mimicry. Second, let's look at the scarlet king snake. It has red, yellow, and black bands, very similar to the venomous coral snake. Predators that have encountered coral snakes quickly learn to avoid snakes with that color pattern. The harmless king snake benefits from this resemblance, gaining protection without actually being venomous. So, in both cases, mimicry provides a survival advantage by deceiving predators.