托福口语 Task 4

Today, we're going to talk about a fascinating behavior in the animal kingdom called 'mimicry for protection.' Now, mimicry isn't just about looking like another animal; it's about survival. Some species have evolved to imitate a more dangerous or unpalatable species, which deters predators. This is called Batesian mimicry. Let me give you two examples. First, consider the scarlet king snake. It has bright red, yellow, and black bands, very similar to the venomous coral snake. Predators avoid it because they mistake it for the dangerous one. But the king snake is harmless. Second, think about the viceroy butterfly. For years, scientists thought it was a mimic of the monarch butterfly, which is toxic to birds. However, recent research shows that the viceroy is also distasteful to birds. So, this is actually an example of Müllerian mimicry, where two unpalatable species resemble each other, reinforcing the warning signal. In both cases, the mimicry increases the chance of survival, but the mechanism differs slightly.