托福口语 Task 4

Today, we're going to discuss 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. First, there's Batesian mimicry, where a harmless species imitates a dangerous or unpalatable one to avoid predators. For example, the scarlet king snake, which is harmless, has bright red, yellow, and black bands that closely resemble the venomous coral snake. Predators that have learned to avoid the coral snake also avoid the king snake. Second, there's Müllerian mimicry, where two or more unpalatable species evolve to look alike. This benefits all of them because predators learn more quickly to avoid the shared warning pattern. For instance, several species of poisonous butterflies in the Amazon, like the heliconius and the ithomiine, have similar orange and black wing patterns. Each species has its own toxin, but by looking alike, they share the cost of educating predators, which increases their overall survival.