托福口语 Task 4

Today we're going to talk about a fascinating behavioral adaptation in animals called 'autotomy'—the voluntary shedding of a body part to escape predators. This is not random; it's a survival strategy. Now, the key point is that autotomy is always a trade-off: the animal gains immediate escape but pays a long-term cost. Let me give you two examples. First, consider the common gecko. When a predator grabs its tail, the gecko can detach the tail, which wiggles for a few seconds, distracting the predator while the gecko runs away. The cost? The tail takes weeks to regrow, and during that time the gecko loses its fat reserves stored in the tail, reducing its energy for growth and reproduction. Second, there's the sea cucumber. When threatened, it can eject its internal organs through its mouth. The predator is often confused or repelled by the sticky, toxic mass. The sea cucumber then escapes, but regenerating those organs requires enormous energy, leaving it vulnerable to infection and starvation for months. So, in both cases, the immediate benefit of survival is balanced against a significant future cost.