托福口语 Task 4

Today we're going to talk about a fascinating concept in biology known as 'mimicry.' Mimicry occurs when one species evolves to resemble another species, often for protection. The main point I want to emphasize is that mimicry can be classified into two types based on the relationship between the mimicking species and the model species. The first type is called Batesian mimicry, where a harmless species imitates a dangerous or unpalatable one to fool predators. For example, the scarlet king snake, which is non-venomous, 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. The second type is Müllerian mimicry, where two or more harmful species evolve to look alike, reinforcing the warning signal. For instance, several species of stinging bees and wasps share similar black-and-yellow stripes. Predators learn quickly to avoid all of them, benefiting each species because fewer individuals are attacked while predators learn the lesson. So, the key distinction is that Batesian mimicry involves a harmless imitator, while Müllerian mimicry involves mutual benefit among dangerous species.