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 unique behaviors to survive in extreme environments. One classic example is the desert kangaroo rat. This small rodent lives in the scorching deserts of North America, where water is incredibly scarce. To avoid overheating and losing precious body moisture, it is nocturnal—it stays in its cool burrow during the day and comes out only at night to forage for seeds. Moreover, it obtains almost all the water it needs from the metabolic breakdown of the dry seeds it eats, and it produces extremely concentrated urine to minimize water loss. Now, consider another example: the king penguin in Antarctica. To survive the brutal cold, these birds huddle together in massive groups. By doing so, they reduce their exposed surface area, which helps them conserve body heat. Penguins on the outer edge of the huddle constantly rotate inward, ensuring that no individual stays on the cold periphery for too long. This cooperative behavior is crucial for their survival during the long winter months.