การฟัง TOEFL

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Listen to part of a lecture in a biology class. The professor is discussing the behavior of a particular species of bird. Professor: Today, I want to talk about the mating rituals of the bowerbird, a species native to Australia and New Guinea. Unlike most birds that use song or bright plumage to attract mates, the male bowerbird builds an elaborate structure called a bower. This bower is not a nest; it's a display area. The male decorates it with objects he collects, such as berries, shells, and even human-made items like bottle caps. The color blue seems to be particularly attractive to females. Interestingly, research has shown that females visit multiple bowers before making a choice. They assess the quality of the structure and the number of decorations. A well-built bower with many blue objects often indicates a healthier, more experienced male. However, there's a downside to this behavior. Collecting objects takes a lot of time and energy, and a male might steal from his neighbors. This can lead to conflicts. So, while the bower is a key to reproductive success, it also creates competition and even aggression among males. Now, let's consider how this relates to the concept of mate choice...