托福口语 Task 4

Today, I want to talk about a fascinating concept in biology called 'mimicry'. Now, mimicry is when one species evolves to look or behave like another species, often to gain some survival advantage. But the key point is that mimicry isn't always about copying a dangerous species. Sometimes it's about copying a harmless one. Let me give you two examples. First, consider the scarlet king snake. This snake is harmless, but it has evolved to look almost identical to the deadly coral snake. Predators learn to avoid the coral snake's bright red, yellow, and black bands, and so they also avoid the king snake. This is called Batesian mimicry, where a harmless species imitates a harmful one. Now, my second example is the opposite. There's a type of flower called the bee orchid. It produces petals that look and even smell like a female bee. Male bees are attracted to these flowers, thinking they've found a mate. As the bee tries to mate with the flower, it picks up pollen and transfers it to the next bee orchid it visits. Here, the flower is mimicking a harmless, attractive signal to get help with pollination. So, you see, mimicry can work in different ways, depending on what the organism needs.