托福口语 Task 4

Today, we're going to talk about a fascinating concept in biology called 'mimicry' — specifically, how some animals have evolved to imitate other species for survival. The main point is that mimicry can serve two distinct purposes: protection from predators and gaining a feeding advantage. Let me give you two examples. First, consider the harmless milk snake. It has evolved to resemble the venomous coral snake, with similar red, yellow, and black banding. Predators that have learned to avoid the coral snake also avoid the milk snake, providing it with protection. Second, think about the cleaner wrasse, a small fish that eats parasites off larger fish. Some species, like the saber-toothed blenny, mimic the cleaner wrasse's appearance and swimming pattern. When a larger fish approaches expecting a cleaning, the blenny instead takes a bite of its fin or flesh. This gives the blenny a free meal without the energy cost of hunting. So, mimicry is a powerful evolutionary tool, but its function varies depending on the species' needs.