托福口语 Task 4

Today, we're going to talk about a fascinating concept in biology called 'mimicry' — where one species evolves to look like another. This isn't just about camouflage; it's about deception for survival. There are two main types: Batesian mimicry, where a harmless species imitates a dangerous one to fool predators, and Mullerian mimicry, where two or more dangerous species evolve to look alike, reinforcing the warning signal. Let me give you two examples. First, consider the scarlet king snake, which is harmless but has the same red, yellow, and black banding as the venomous coral snake. Predators that have learned to avoid coral snakes also avoid the king snake, even though it's safe to eat. Second, think about several species of stinging bees and wasps. They all share similar black and yellow stripes. This shared pattern helps predators learn faster — if a predator gets stung once by any of these, it will avoid all of them, reducing the risk for each species. So, mimicry is a powerful evolutionary strategy that can involve harmless species exploiting warnings or harmful species pooling their defenses.