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 of mimicry: Batesian and Müllerian. In Batesian mimicry, a harmless species mimics a dangerous or unpalatable one to avoid predators. For example, the scarlet king snake, which is non-venomous, has developed the same bright red, yellow, and black banding as the venomous coral snake. Predators learn to avoid the coral snake's colors, and thus also avoid the harmless king snake. In contrast, Müllerian mimicry involves two or more dangerous species evolving to look alike. This mutual resemblance reinforces the warning signal, as predators learn more quickly to avoid them. For instance, various species of stinging bees and wasps share similar black-and-yellow stripes. Even though they are all dangerous, sharing the same pattern helps predators learn to avoid all of them more efficiently, benefiting the entire group.