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 to gain an advantage. There are two main types: Batesian mimicry and Mullerian mimicry. In Batesian mimicry, a harmless species imitates a dangerous or poisonous one to avoid predators. For example, the scarlet king snake, which is harmless, has red, yellow, and black bands similar to the venomous coral snake. Predators learn to avoid the coral snake's colors, so they also avoid the king snake. In Mullerian mimicry, two or more harmful species evolve to look alike, which helps them share the cost of teaching predators. For instance, several species of stinging wasps and bees have similar black-and-yellow stripes. Since predators learn quickly to avoid these colors after one bad experience, all the species involved benefit because fewer individuals are eaten during the learning process. So, mimicry is a powerful survival strategy that can involve trickery or cooperation.