托福口语 Task 4

Today we're going to talk about a fascinating survival strategy used by some animals called 'autotomy'—the voluntary shedding of a body part to escape predators. The main point I want you to grasp is that autotomy is not just a simple reflex; it's an adaptive behavior that involves a trade-off between immediate survival and long-term costs. Let me give you two examples. First, consider the green anole lizard. When attacked by a snake, it can drop its tail. The tail twitches vigorously, distracting the predator while the lizard escapes. However, the lizard loses energy reserves stored in the tail and must expend extra energy to regrow it, making it temporarily slower and more vulnerable to future attacks. Second, there's the sea cucumber. When threatened, it can expel its internal organs through its mouth. The sticky, toxic organs entangle the predator, allowing the sea cucumber to crawl away. But this is a costly move: it takes weeks to regenerate the organs, during which the sea cucumber cannot feed properly and is more susceptible to disease. So, in both cases, the animal sacrifices a significant body part to survive an immediate threat, but pays a long-term price.