托福口语 Task 4

Today, I want to talk about a fascinating adaptation in the animal kingdom: camouflage. Specifically, I'll focus on how some animals use camouflage not just to hide from predators, but also to hunt prey. This is often called 'aggressive mimicry.' Take the leaf-mimicking katydid, for example. This insect has wings that look exactly like green leaves, complete with veins and even spots that mimic damage. It stays perfectly still on a plant, blending in so well that birds and other predators pass it by. But that's just half the story. When a smaller insect, like a fly, lands nearby thinking it's safe on a leaf, the katydid's disguise allows it to get close enough to strike and catch the fly. Another example is the stonefish. It lies motionless on the ocean floor, looking like a rough, algae-covered rock. Small fish and shrimp, unaware of the danger, swim close to it. When they get near enough, the stonefish lunges forward in a split second, engulfing its prey. So, in both cases, camouflage serves a dual purpose: protection from enemies and a stealthy way to capture food.