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These changes, which gave birds greater facility for flight, made them more effective predators. It’s not difficult to imagine that they feasted on giant insects.
這些變化明顯增強了鳥類的飛行能力，進而提高了它們的捕食效率。不難想象，他們開始將大型昆蟲作為獵捕目標。
That’s one theory, at least. Another holds that rather than eat giant insects, prehistoric birds simply out competed them. Both birds and giant insects ate smaller insects that existed alongside their super-sized cousins. Evolution may have enabled birds not only to dine on giant insects but also to consume smaller insects and deplete their competitors’ food source.
至少，這是其中的一項理論。另一種理論認為，與其說史前鳥類以巨型昆蟲為食，不如說其淘汰掉了巨型昆蟲。鳥類和巨型昆蟲均以較小昆蟲為食，而小型昆蟲的棲息地又臨近大型昆蟲。進化后的鳥類不僅能夠捕食巨型昆蟲，同時還能捕食小型昆蟲，從而消耗競爭對手——巨型昆蟲的食物來源。
