托福口语 Task 4

Today, we're going to talk about a fascinating concept in biology called 'mimicry.' Mimicry is when one species evolves to look or behave like another species, often to gain a survival advantage. There are two main types of mimicry, and I'll give you an example of each. First, there's Batesian mimicry, where a harmless species imitates a dangerous or toxic one to avoid predators. For instance, the scarlet king snake, which is harmless, has the same red, yellow, and black banding as the venomous coral snake. Predators learn to avoid the coral snake's colors, so they also avoid the king snake. Second, there's Mullerian mimicry, where two or more harmful species evolve to look alike. This helps them share the cost of teaching predators to avoid them. For example, the monarch butterfly and the viceroy butterfly both have similar orange, black, and white patterns, and both are toxic to birds. Because they look alike, when a bird eats one and gets sick, it learns to avoid both species, benefiting both. So, in essence, mimicry is a powerful evolutionary tool that reduces predation risk, whether through deception or shared warning signals.