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: Batesian and Müllerian. In Batesian mimicry, a harmless species imitates a dangerous or toxic one to avoid predators. For example, 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 and thus also avoid the king snake. In Müllerian mimicry, two or more harmful species evolve to look alike, which reinforces the warning signal. For instance, several species of stinging bees and wasps share similar black-and-yellow stripes. Predators quickly learn to avoid both, and because they both benefit from the shared signal, the mimicry mutual reinforces their protection. Both types show how mimicry can be a powerful evolutionary tool.