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在自然界中，昆虫不计其数，小动物随处可见，而大型动物特别是凶猛的肉食动物却数量稀少。这是为什么呢？原来，在漫长的自然选择的进化过程中，各种生物之间构成了一种金字塔型的食物链，金字塔底层的生物量极为丰富，而处于顶层的大型哺乳动物则数量极为稀少。食物金字?
In nature, there are countless insects, small animals are everywhere, and large animals, especially ferocious carnivores, are rare. Why is this? It turns out that during the long process of natural selection evolution, various creatures formed a pyramid-shaped food chain. The bottom of the pyramid is rich in biomass, and the number of large mammals at the top is extremely rare. Food gold?