托福口语 Task 4

Today, we're going to talk about a fascinating concept in biology called 'behavioral adaptation.' Specifically, I want to focus on how some animals have evolved unusual behaviors to cope with extreme environments. One key idea is that these behaviors are not learned but are innate, passed down through generations. Let me give you two examples. First, consider the desert kangaroo rat. It lives in arid regions where water is scarce. To survive, it never drinks water. Instead, it gets all its moisture from the seeds it eats, and its kidneys are so efficient that it produces extremely concentrated urine, losing almost no water. Second, think about the wood frog in North America. During winter, its body freezes solid—up to 65% of its water turns to ice. But it survives because its liver produces massive amounts of glucose, which acts like antifreeze, preventing ice crystals from damaging its cells. When spring comes, it thaws and resumes normal activity. These examples illustrate how innate behavioral and physiological adaptations allow species to thrive in otherwise inhospitable habitats.