托福口语 Task 4

Today, we're going to talk about a fascinating concept in animal behavior called 'shelter-building.' This is when animals construct structures to protect themselves from environmental threats. The main point I want to make is that shelter-building is not just about physical protection; it also serves social and reproductive functions. Let me give you two examples. First, consider the beaver. Beavers build dams and lodges using branches and mud. These structures create ponds that protect them from predators like wolves, but they also serve a social purpose—the pond allows multiple beaver families to live together, which helps them cooperate in raising young and defending their territory. Second, think about the male bowerbird. The male builds an elaborate structure—a bower—decorated with colorful objects like berries and shells. This bower isn't for protection; it's purely for attracting a mate. The quality of the bower signals the male's fitness, and females choose mates based on how impressive the bower is. So, as you can see, shelter-building can go beyond basic survival needs.