托福口语 Task 4

Today we're going to talk about a fascinating adaptation in the animal kingdom: behavioral thermoregulation. This is when animals adjust their behavior to control their body temperature, rather than relying solely on physiological mechanisms. Let me give you two examples. First, consider the desert lizard. In the early morning, when it's cool, the lizard will bask on sun-warmed rocks to raise its body temperature and become active. But as the midday sun becomes scorching, it will retreat into the shade or burrow underground to avoid overheating. This way, it maintains an optimal temperature for hunting and digestion. Second, think about honeybees. When the hive gets too hot, worker bees will collect water and spread it over the hive's surface. Then, other bees fan their wings to increase evaporation, which cools the hive. Conversely, in cold weather, bees cluster together and shiver their flight muscles to generate heat. This behavior ensures the colony survives temperature extremes. So, behavioral thermoregulation is a flexible and crucial strategy for many species.