托福口语 Task 4

Today, we're going to discuss a fascinating concept in biology called 'behavioral thermoregulation'—how animals control their body temperature through behavior rather than physiology. This is crucial for survival, especially for ectotherms, or cold-blooded animals, which cannot generate their own heat. One main point is that behavioral thermoregulation allows animals to optimize their activity levels while minimizing energy expenditure. Let me give you two examples. First, consider the desert iguana. In the morning, it basks in the sun to warm up, but during the hottest part of the day, it retreats to the shade of rocks or burrows to avoid overheating. This behavior keeps its body temperature within a safe range, allowing it to forage for food without wasting energy on excessive cooling. Second, think about the honeybee. In the hive, bees cluster together and shiver their flight muscles to generate heat in cold weather, and in hot weather, they fan their wings to circulate air and cool the hive. This collective behavior ensures the hive's temperature stays optimal for brood development, even when external conditions fluctuate.