In fact, all living species in nature are bound by complex relations of interdependency. Each species has its own value, and even super-ficially harmful birds have their value for human survival.
事實上，自然界的各種生物彼此相依，關係錯綜複雜，每種生物都有它存在的價值，甚至表面看來影響人類利益的鳥類，對人類的生存也有其意義。