托福口语 Task 4

Today, we're going to talk about a fascinating concept in biology called 'mimicry.' Mimicry occurs when one species evolves to resemble another species, often to gain a survival advantage. There are two main types: Batesian mimicry, where a harmless species imitates a dangerous one to avoid predators, and Müllerian mimicry, where two harmful species evolve to look alike, reinforcing the warning signal to predators. Let me give you two examples. First, consider the scarlet kingsnake, which is harmless, but it has bright red, yellow, and black bands similar to the venomous coral snake. Predators learn to avoid the coral snake, so they also avoid the kingsnake, giving it protection. Second, think of the monarch butterfly and the viceroy butterfly. Both are toxic to birds, and over time, they have evolved similar orange-and-black patterns. Because they both share the same warning coloration, predators learn to avoid them more quickly, benefiting both species. So, mimicry is a powerful evolutionary strategy that enhances survival through resemblance.