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 and Müllerian mimicry. In Batesian mimicry, a harmless species imitates a dangerous or unpalatable one to fool predators. For example, the harmless scarlet king snake has red, yellow, and black bands, very similar to the venomous coral snake. Predators avoid the king snake because they mistake it for the coral snake. In contrast, Müllerian mimicry involves two or more unpalatable species that evolve to look alike, reinforcing the warning signal. For instance, several species of stinging bees and wasps share similar yellow-and-black stripes. Predators learn quickly to avoid any insect with those stripes, benefiting all the species involved. So, while both types involve imitation, Batesian mimicry is a deceitful copy, while Müllerian mimicry is a mutual reinforcement among dangerous species.