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, often to gain a survival advantage. There are many types, but I want to focus on two: defensive mimicry and aggressive mimicry. Defensive mimicry occurs when a harmless species imitates a dangerous or unpalatable one to avoid being eaten. For example, the viceroy butterfly looks almost identical to the monarch butterfly, which is toxic to birds. Because birds learn to avoid monarchs, they also avoid viceroys, giving the viceroy protection without being poisonous itself. On the other hand, aggressive mimicry is when a predator or parasite imitates a harmless species to lure its prey. Consider the anglerfish, which lives in the deep ocean. It has a fleshy growth on its head that glows and wiggles like a small fish or worm. When smaller fish come to investigate this tempting meal, the anglerfish snaps them up. So, in both cases, mimicry is a clever adaptation that increases the organism's chances of survival, either by avoiding predators or by catching prey more efficiently.