托福口语 Task 4

Today, we're going to talk about a fascinating concept in animal behavior called 'behavioral thermoregulation.' This is when animals actively change their behavior to control their body temperature, rather than relying solely on physiological mechanisms like sweating or shivering. The key point is that these behaviors are often quite sophisticated and can involve social coordination. Let me give you two examples. First, consider the desert locust. In the heat of the day, these insects will cluster together in large groups on the ground. By huddling, they reduce their exposed surface area, which helps them retain moisture and avoid overheating. But when the temperature drops in the evening, they spread out and climb up onto plants to catch the warmth of the sun. So, they adjust their grouping and position based on the time of day. Second, think about emperor penguins in Antarctica. During the brutal winter, they form massive, tightly packed huddles. The penguins on the outside constantly rotate to the inside, so no individual stays on the cold perimeter for too long. This rotation ensures that all members share the warmth, and it reduces heat loss by up to 50%. These examples show how animals use social behavior and movement to manage their thermal environment.